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Lightning not working after upgrade

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Windows 10 machine. Thunderbird upgraded to 52.4.0 yesterday and I lost Lightning when it did. I've tried reinstalling Lightning, tried downgrading TB and then reinstalling Lightning and tried disabling Lightning, thinking I could re-enable it. Nothing has worked so far. Lightning remains disabled and I can't figure out how to re-enable it. TB remains at 52.3.0. Any thoughts on how I can get Lightning back? Many thanks!

Windows 10 machine. Thunderbird upgraded to 52.4.0 yesterday and I lost Lightning when it did. I've tried reinstalling Lightning, tried downgrading TB and then reinstalling Lightning and tried disabling Lightning, thinking I could re-enable it. Nothing has worked so far. Lightning remains disabled and I can't figure out how to re-enable it. TB remains at 52.3.0. Any thoughts on how I can get Lightning back? Many thanks!

Chosen solution

Issue resolved. I decided to shut down TB and then reboot the computer (I'd done this several times previously without success, but why not?). After the reboot, I started TB again and lo and behold, Lightning is back working with everything intact. I am at a loss to explain how and why that worked, but I'm not going to look a gift horse in the mouth.

Thank you for all of your efforts today in trying to help me resolve this. I have to think that at least one of the steps you suggested contributed to the solution and I truly appreciate the assistance. Have a great rest of your day!

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Additional System Details

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

More Information

Question owner

Troubleshooting info:

 Application Basics
   Name: Thunderbird
   Version: 52.3.0
   User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0
   Profile Folder: Open Folder
             (Local drive)
   Application Build ID: 20170815040357
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory
   Profiles: about:profiles
 Mail and News Accounts
   account1:
     INCOMING: account1, , (pop3) pop.earthlink.net:110, plain, passwordEncrypted
     OUTGOING: , smtpauth.earthlink.net:587, alwaysSTARTTLS, passwordEncrypted, true
   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext
   account3:
     INCOMING: account3, , (pop3) pop.earthlink.net:110, plain, passwordEncrypted
     OUTGOING: , smtpauth.earthlink.net:587, alwaysSTARTTLS, passwordEncrypted, true
   account5:
     INCOMING: account5, , (pop3) pop.earthlink.net:110, plain, passwordEncrypted
     OUTGOING: , smtpauth.earthlink.net:587, alwaysSTARTTLS, passwordEncrypted, true
 Crash Reports
 Extensions
 Important Modified Preferences
   Name: Value
     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     browser.cache.disk.smart_size_cached_value: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     dom.apps.reset-permissions: true
     extensions.lastAppVersion: 52.3.0
     font.internaluseonly.changed: true
     font.minimum-size.x-western: 12
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Courier
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Verdana
     font.name.serif.el: Cambria
     font.name.serif.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 12
     font.size.variable.el: 17
     font.size.variable.tr: 17
     font.size.variable.x-baltic: 17
     font.size.variable.x-central-euro: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 12
     gfx.direct3d.last_used_feature_level_idx: 1
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: 2044cd77-a5cf-4590-b6f3-1cc5d594bab
     mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"19"},"flaggedCol":{"visible":true,"ordinal":"5"},"attachmentCol":{"visible":fals…
     mailnews.database.global.views.global.columns: {"threadCol":{"visible":true,"ordinal":"19"},"flaggedCol":{"visible":true,"ordinal":"5"},"attachmentCol":{"visible":fals…
     media.gmp.storage.version.observed: 1
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1507979497
     places.history.expiration.transient_current_max_pages: 49262
     plugin.importedState: true
     plugin.state.npbestbuypcappdetector: 0
     print.printer_Brother_MFC-J475DW_Printer.print_bgcolor: false
     print.printer_Brother_MFC-J475DW_Printer.print_bgimages: false
     print.printer_Brother_MFC-J475DW_Printer.print_colorspace:
     print.printer_Brother_MFC-J475DW_Printer.print_command:
     print.printer_Brother_MFC-J475DW_Printer.print_downloadfonts: false
     print.printer_Brother_MFC-J475DW_Printer.print_duplex: 1515870810
     print.printer_Brother_MFC-J475DW_Printer.print_edge_bottom: 0
     print.printer_Brother_MFC-J475DW_Printer.print_edge_left: 0
     print.printer_Brother_MFC-J475DW_Printer.print_edge_right: 0
     print.printer_Brother_MFC-J475DW_Printer.print_edge_top: 0
     print.printer_Brother_MFC-J475DW_Printer.print_evenpages: true
     print.printer_Brother_MFC-J475DW_Printer.print_footercenter:
     print.printer_Brother_MFC-J475DW_Printer.print_footerleft: &PT
     print.printer_Brother_MFC-J475DW_Printer.print_footerright: &D
     print.printer_Brother_MFC-J475DW_Printer.print_headercenter:
     print.printer_Brother_MFC-J475DW_Printer.print_headerleft: &T
     print.printer_Brother_MFC-J475DW_Printer.print_headerright: &U
     print.printer_Brother_MFC-J475DW_Printer.print_in_color: true
     print.printer_Brother_MFC-J475DW_Printer.print_margin_bottom: 0.5
     print.printer_Brother_MFC-J475DW_Printer.print_margin_left: 0.5
     print.printer_Brother_MFC-J475DW_Printer.print_margin_right: 0.5
     print.printer_Brother_MFC-J475DW_Printer.print_margin_top: 0.5
     print.printer_Brother_MFC-J475DW_Printer.print_oddpages: true
     print.printer_Brother_MFC-J475DW_Printer.print_orientation: 0
     print.printer_Brother_MFC-J475DW_Printer.print_page_delay: 50
     print.printer_Brother_MFC-J475DW_Printer.print_paper_data: 1
     print.printer_Brother_MFC-J475DW_Printer.print_paper_height: 11.00
     print.printer_Brother_MFC-J475DW_Printer.print_paper_name:
     print.printer_Brother_MFC-J475DW_Printer.print_paper_size_type: 0
     print.printer_Brother_MFC-J475DW_Printer.print_paper_size_unit: 0
     print.printer_Brother_MFC-J475DW_Printer.print_paper_width: 8.50
     print.printer_Brother_MFC-J475DW_Printer.print_plex_name:
     print.printer_Brother_MFC-J475DW_Printer.print_resolution: 1515870810
     print.printer_Brother_MFC-J475DW_Printer.print_resolution_name:
     print.printer_Brother_MFC-J475DW_Printer.print_reversed: false
     print.printer_Brother_MFC-J475DW_Printer.print_scaling: 1.00
     print.printer_Brother_MFC-J475DW_Printer.print_shrink_to_fit: true
     print.printer_Brother_MFC-J475DW_Printer.print_to_file: false
     print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_bottom: 0
     print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_left: 0
     print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_right: 0
     print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_top: 0
     print.printer_HP_Photosmart_D110_series.print_bgcolor: false
     print.printer_HP_Photosmart_D110_series.print_bgimages: false
     print.printer_HP_Photosmart_D110_series.print_colorspace:
     print.printer_HP_Photosmart_D110_series.print_command:
     print.printer_HP_Photosmart_D110_series.print_downloadfonts: false
     print.printer_HP_Photosmart_D110_series.print_duplex: 0
     print.printer_HP_Photosmart_D110_series.print_edge_bottom: 0
     print.printer_HP_Photosmart_D110_series.print_edge_left: 0
     print.printer_HP_Photosmart_D110_series.print_edge_right: 0
     print.printer_HP_Photosmart_D110_series.print_edge_top: 0
     print.printer_HP_Photosmart_D110_series.print_evenpages: true
     print.printer_HP_Photosmart_D110_series.print_footercenter:
     print.printer_HP_Photosmart_D110_series.print_footerleft: &PT
     print.printer_HP_Photosmart_D110_series.print_footerright: &D
     print.printer_HP_Photosmart_D110_series.print_headercenter:
     print.printer_HP_Photosmart_D110_series.print_headerleft: &T
     print.printer_HP_Photosmart_D110_series.print_headerright: &U
     print.printer_HP_Photosmart_D110_series.print_in_color: true
     print.printer_HP_Photosmart_D110_series.print_margin_bottom: 0.5
     print.printer_HP_Photosmart_D110_series.print_margin_left: 0.5
     print.printer_HP_Photosmart_D110_series.print_margin_right: 0.5
     print.printer_HP_Photosmart_D110_series.print_margin_top: 0.5
     print.printer_HP_Photosmart_D110_series.print_oddpages: true
     print.printer_HP_Photosmart_D110_series.print_orientation: 0
     print.printer_HP_Photosmart_D110_series.print_page_delay: 50
     print.printer_HP_Photosmart_D110_series.print_paper_data: 1
     print.printer_HP_Photosmart_D110_series.print_paper_height: 11.00
     print.printer_HP_Photosmart_D110_series.print_paper_name:
     print.printer_HP_Photosmart_D110_series.print_paper_size_type: 0
     print.printer_HP_Photosmart_D110_series.print_paper_size_unit: 0
     print.printer_HP_Photosmart_D110_series.print_paper_width: 8.50
     print.printer_HP_Photosmart_D110_series.print_plex_name:
     print.printer_HP_Photosmart_D110_series.print_resolution: 0
     print.printer_HP_Photosmart_D110_series.print_resolution_name:
     print.printer_HP_Photosmart_D110_series.print_reversed: false
     print.printer_HP_Photosmart_D110_series.print_scaling: 1.00
     print.printer_HP_Photosmart_D110_series.print_shrink_to_fit: true
     print.printer_HP_Photosmart_D110_series.print_to_file: false
     print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_bottom: 0
     print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_left: 0
     print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_right: 0
     print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_top: 0
     security.sandbox.content.tempDirSuffix: {611e9f1b-fe04-441a-b06c-47f6256fb795}
Troubleshooting info: Application Basics Name: Thunderbird Version: 52.3.0 User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 Profile Folder: Open Folder (Local drive) Application Build ID: 20170815040357 Enabled Plugins: about:plugins Build Configuration: about:buildconfig Memory Use: about:memory Profiles: about:profiles Mail and News Accounts account1: INCOMING: account1, , (pop3) pop.earthlink.net:110, plain, passwordEncrypted OUTGOING: , smtpauth.earthlink.net:587, alwaysSTARTTLS, passwordEncrypted, true account2: INCOMING: account2, , (none) Local Folders, plain, passwordCleartext account3: INCOMING: account3, , (pop3) pop.earthlink.net:110, plain, passwordEncrypted OUTGOING: , smtpauth.earthlink.net:587, alwaysSTARTTLS, passwordEncrypted, true account5: INCOMING: account5, , (pop3) pop.earthlink.net:110, plain, passwordEncrypted OUTGOING: , smtpauth.earthlink.net:587, alwaysSTARTTLS, passwordEncrypted, true Crash Reports Extensions Important Modified Preferences Name: Value browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.smart_size_cached_value: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false dom.apps.reset-permissions: true extensions.lastAppVersion: 52.3.0 font.internaluseonly.changed: true font.minimum-size.x-western: 12 font.name.monospace.el: Consolas font.name.monospace.tr: Consolas font.name.monospace.x-baltic: Consolas font.name.monospace.x-central-euro: Consolas font.name.monospace.x-cyrillic: Consolas font.name.monospace.x-unicode: Consolas font.name.monospace.x-western: Courier font.name.sans-serif.el: Calibri font.name.sans-serif.tr: Calibri font.name.sans-serif.x-baltic: Calibri font.name.sans-serif.x-central-euro: Calibri font.name.sans-serif.x-cyrillic: Calibri font.name.sans-serif.x-unicode: Calibri font.name.sans-serif.x-western: Verdana font.name.serif.el: Cambria font.name.serif.tr: Cambria font.name.serif.x-baltic: Cambria font.name.serif.x-central-euro: Cambria font.name.serif.x-cyrillic: Cambria font.name.serif.x-unicode: Cambria font.name.serif.x-western: Cambria font.size.fixed.el: 14 font.size.fixed.tr: 14 font.size.fixed.x-baltic: 14 font.size.fixed.x-central-euro: 14 font.size.fixed.x-cyrillic: 14 font.size.fixed.x-unicode: 14 font.size.fixed.x-western: 12 font.size.variable.el: 17 font.size.variable.tr: 17 font.size.variable.x-baltic: 17 font.size.variable.x-central-euro: 17 font.size.variable.x-cyrillic: 17 font.size.variable.x-unicode: 17 font.size.variable.x-western: 12 gfx.direct3d.last_used_feature_level_idx: 1 mail.openMessageBehavior.version: 1 mail.winsearch.firstRunDone: true mailnews.database.global.datastore.id: 2044cd77-a5cf-4590-b6f3-1cc5d594bab mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"19"},"flaggedCol":{"visible":true,"ordinal":"5"},"attachmentCol":{"visible":fals… mailnews.database.global.views.global.columns: {"threadCol":{"visible":true,"ordinal":"19"},"flaggedCol":{"visible":true,"ordinal":"5"},"attachmentCol":{"visible":fals… media.gmp.storage.version.observed: 1 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1507979497 places.history.expiration.transient_current_max_pages: 49262 plugin.importedState: true plugin.state.npbestbuypcappdetector: 0 print.printer_Brother_MFC-J475DW_Printer.print_bgcolor: false print.printer_Brother_MFC-J475DW_Printer.print_bgimages: false print.printer_Brother_MFC-J475DW_Printer.print_colorspace: print.printer_Brother_MFC-J475DW_Printer.print_command: print.printer_Brother_MFC-J475DW_Printer.print_downloadfonts: false print.printer_Brother_MFC-J475DW_Printer.print_duplex: 1515870810 print.printer_Brother_MFC-J475DW_Printer.print_edge_bottom: 0 print.printer_Brother_MFC-J475DW_Printer.print_edge_left: 0 print.printer_Brother_MFC-J475DW_Printer.print_edge_right: 0 print.printer_Brother_MFC-J475DW_Printer.print_edge_top: 0 print.printer_Brother_MFC-J475DW_Printer.print_evenpages: true print.printer_Brother_MFC-J475DW_Printer.print_footercenter: print.printer_Brother_MFC-J475DW_Printer.print_footerleft: &PT print.printer_Brother_MFC-J475DW_Printer.print_footerright: &D print.printer_Brother_MFC-J475DW_Printer.print_headercenter: print.printer_Brother_MFC-J475DW_Printer.print_headerleft: &T print.printer_Brother_MFC-J475DW_Printer.print_headerright: &U print.printer_Brother_MFC-J475DW_Printer.print_in_color: true print.printer_Brother_MFC-J475DW_Printer.print_margin_bottom: 0.5 print.printer_Brother_MFC-J475DW_Printer.print_margin_left: 0.5 print.printer_Brother_MFC-J475DW_Printer.print_margin_right: 0.5 print.printer_Brother_MFC-J475DW_Printer.print_margin_top: 0.5 print.printer_Brother_MFC-J475DW_Printer.print_oddpages: true print.printer_Brother_MFC-J475DW_Printer.print_orientation: 0 print.printer_Brother_MFC-J475DW_Printer.print_page_delay: 50 print.printer_Brother_MFC-J475DW_Printer.print_paper_data: 1 print.printer_Brother_MFC-J475DW_Printer.print_paper_height: 11.00 print.printer_Brother_MFC-J475DW_Printer.print_paper_name: print.printer_Brother_MFC-J475DW_Printer.print_paper_size_type: 0 print.printer_Brother_MFC-J475DW_Printer.print_paper_size_unit: 0 print.printer_Brother_MFC-J475DW_Printer.print_paper_width: 8.50 print.printer_Brother_MFC-J475DW_Printer.print_plex_name: print.printer_Brother_MFC-J475DW_Printer.print_resolution: 1515870810 print.printer_Brother_MFC-J475DW_Printer.print_resolution_name: print.printer_Brother_MFC-J475DW_Printer.print_reversed: false print.printer_Brother_MFC-J475DW_Printer.print_scaling: 1.00 print.printer_Brother_MFC-J475DW_Printer.print_shrink_to_fit: true print.printer_Brother_MFC-J475DW_Printer.print_to_file: false print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_bottom: 0 print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_left: 0 print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_right: 0 print.printer_Brother_MFC-J475DW_Printer.print_unwriteable_margin_top: 0 print.printer_HP_Photosmart_D110_series.print_bgcolor: false print.printer_HP_Photosmart_D110_series.print_bgimages: false print.printer_HP_Photosmart_D110_series.print_colorspace: print.printer_HP_Photosmart_D110_series.print_command: print.printer_HP_Photosmart_D110_series.print_downloadfonts: false print.printer_HP_Photosmart_D110_series.print_duplex: 0 print.printer_HP_Photosmart_D110_series.print_edge_bottom: 0 print.printer_HP_Photosmart_D110_series.print_edge_left: 0 print.printer_HP_Photosmart_D110_series.print_edge_right: 0 print.printer_HP_Photosmart_D110_series.print_edge_top: 0 print.printer_HP_Photosmart_D110_series.print_evenpages: true print.printer_HP_Photosmart_D110_series.print_footercenter: print.printer_HP_Photosmart_D110_series.print_footerleft: 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print.printer_HP_Photosmart_D110_series.print_paper_size_unit: 0 print.printer_HP_Photosmart_D110_series.print_paper_width: 8.50 print.printer_HP_Photosmart_D110_series.print_plex_name: print.printer_HP_Photosmart_D110_series.print_resolution: 0 print.printer_HP_Photosmart_D110_series.print_resolution_name: print.printer_HP_Photosmart_D110_series.print_reversed: false print.printer_HP_Photosmart_D110_series.print_scaling: 1.00 print.printer_HP_Photosmart_D110_series.print_shrink_to_fit: true print.printer_HP_Photosmart_D110_series.print_to_file: false print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_bottom: 0 print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_left: 0 print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_right: 0 print.printer_HP_Photosmart_D110_series.print_unwriteable_margin_top: 0 security.sandbox.content.tempDirSuffix: {611e9f1b-fe04-441a-b06c-47f6256fb795}

Question owner

I've done the "Restart Now" option for Lightning several times and it seems to have no effect - still shows as disabled and still shows the option to "Restart Now".

I've done the "Restart Now" option for Lightning several times and it seems to have no effect - still shows as disabled and still shows the option to "Restart Now".
sfhowes
  • Top 10 Contributor
1438 solutions 6814 answers

From your picture, it looks like you have the Calendar open in a tab, which might disable Lightning on restart. Close the tab, restart TB, and see if you can enable Lightning.

From your picture, it looks like you have the Calendar open in a tab, which might disable Lightning on restart. Close the tab, restart TB, and see if you can enable Lightning.

Question owner

Didn't have the calendar open, but did the restart as you asked anyway. No change. See attached screenshot. Thanks!

Didn't have the calendar open, but did the restart as you asked anyway. No change. See attached screenshot. Thanks!
sfhowes
  • Top 10 Contributor
1438 solutions 6814 answers

When you reinstalled Lightning, did you first Remove it from the Add-ons Manager, restart TB, and then install it again?

When you reinstalled Lightning, did you first Remove it from the Add-ons Manager, restart TB, and then install it again?

Question owner

I've never seen a remove option in Add-ons Manager. The only thing close is the Undo option. Where would I find the remove option?

I've never seen a remove option in Add-ons Manager. The only thing close is the Undo option. Where would I find the remove option?
sfhowes
  • Top 10 Contributor
1438 solutions 6814 answers

I've attached a picture of my Tools/Add-ons/Extensions tab. When you click 'More' for any add-on, you should still see buttons for Options, Disable/Enable and Remove, which are absent in your picture. Which makes me think you have a damaged or incomplete TB installation. A reinstall of TB with the full installer will not affect your profile folder. Manually removing the Lightning add-on involves deleting the {e2fda1a4-762b-4020-b5ad-a41df1933103} folder in the extensions subfolder of the profile folder (Help/Troubleshooting Information, click Open Folder, close TB before editing the profile folder).

I've attached a picture of my Tools/Add-ons/Extensions tab. When you click 'More' for any add-on, you should still see buttons for Options, Disable/Enable and Remove, which are absent in your picture. Which makes me think you have a damaged or incomplete TB installation. A reinstall of TB with [https://www.thunderbird.net/en-US/ the full installer] will not affect your profile folder. Manually removing the Lightning add-on involves deleting the {e2fda1a4-762b-4020-b5ad-a41df1933103} folder in the extensions subfolder of the profile folder (Help/Troubleshooting Information, click Open Folder, close TB before editing the profile folder).

Question owner

Ok. Shut down TB, deleted the {e2fda1a4-762b-4020-b5ad-a41df1933103} folder, re-installed TB, restarted TB and attempted to install Lightning again - same exact results. See attached screenshot.

Ok. Shut down TB, deleted the {e2fda1a4-762b-4020-b5ad-a41df1933103} folder, re-installed TB, restarted TB and attempted to install Lightning again - same exact results. See attached screenshot.

Chosen Solution

Issue resolved. I decided to shut down TB and then reboot the computer (I'd done this several times previously without success, but why not?). After the reboot, I started TB again and lo and behold, Lightning is back working with everything intact. I am at a loss to explain how and why that worked, but I'm not going to look a gift horse in the mouth.

Thank you for all of your efforts today in trying to help me resolve this. I have to think that at least one of the steps you suggested contributed to the solution and I truly appreciate the assistance. Have a great rest of your day!

Issue resolved. I decided to shut down TB and then reboot the computer (I'd done this several times previously without success, but why not?). After the reboot, I started TB again and lo and behold, Lightning is back working with everything intact. I am at a loss to explain how and why that worked, but I'm not going to look a gift horse in the mouth. Thank you for all of your efforts today in trying to help me resolve this. I have to think that at least one of the steps you suggested contributed to the solution and I truly appreciate the assistance. Have a great rest of your day!