Go to View -> Message body as... and select 'Original HTML'

Does that fix it?

Thank you for answering but unfortunately no, it is already set to 'Original HTML'.

I have just set it to plain text and sent myself an email, and set it back to 'original html' and sent a test email. The screen came up both times.

Anything else I can try?

What version of Thunderbird are you using? Do you have any anti-virus software running? Try running without add-ons. Help -> Restart with add-ons disabled.

Try this:

1. Tools -> Error console (or Ctrl-Shift-J); clear the error log (button near top)
2. send yourself another email
3. look at the error log again and tell me what you got

Another thought: View -> Headers -> Normal

I'm using 31.5.0 on Windows 7, AVG free anti-virus.

Headers are set to normal, and I've attached a screen shot of the error console after sending an email in safe mode. I still got the screen of code in safe mode.

Thanks for all your help.

1. disable AVG
2. upgrade to TB 31.6.0
3. reboot your computer
4. retest
5. do these next steps if you still have problems

• Help -> Troubleshooting Information -> Copy text to clipboard; then go to http://pastebin.com/ and paste your clipboard there; set the expiration for a week and send me the number it gives you.
• start with step 4 of http://kb.mozillazine.org/Standard_diagnostic_-_Thunderbird

Hi,

The Pastebin id is: kj2yLQrQ.

I'll post more when I've worked through the diagnostics page.

Thanks Helen

Helen, Pastebin said it was already expired, so try it this way (probably simpler anyway):

Help -> Troubleshooting Information -> Copy text to clipboard; then in this question in this forum, right click in the Reply box and select paste. All info will be pasted. Then click on 'Post Reply'.

Application Basics

   Name: Thunderbird
   Version: 31.6.0
   User Agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.6.0
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20150330093429
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory

 Mail and News Accounts
   account1:
     INCOMING: account1, , (none) Local Folders, plain, passwordCleartext

   account3:
     INCOMING: account3, , (pop3) mail.waitrose.com:110, plain, passwordCleartext
     OUTGOING: smtpmail.waitrose.com:25, plain, passwordCleartext, true

   account5:
     INCOMING: account5, , (nntp) news.mozilla.org:119, plain, passwordCleartext
     OUTGOING: smtpmail.waitrose.com:25, plain, passwordCleartext, true

   account7:
     INCOMING: account7, , (pop3) mail.plus.net:110, plain, 0
     OUTGOING: relay.plus.net:25, plain, none, true

 Crash Reports
   http://crash-stats.mozilla.com/report/index/bp-5c528001-1a71-4727-9199-87f8a2120618 (18/06/2012)

 Extensions

 Important Modified Preferences

   Name: Value

     accessibility.typeaheadfind.flashBar: 0
     browser.cache.disk.capacity: 358400
     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
     browser.display.background_color: #FFFFCC
     extensions.lastAppVersion: 31.6.0
     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: Consolas
     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: Calibri
     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: 14
     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: 17
     gfx.direct3d.last_used_feature_level_idx: 1
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: dae52f3f-9503-4d9a-82ab-8de44c7a095
     network.cookie.lifetimePolicy: 2
     network.cookie.prefsMigrated: true
     places.database.lastMaintenance: 1428049122
     places.history.expiration.transient_current_max_pages: 80519
     plugin.importedState: true
     plugins.update.notifyUser: true
     print.print_printer: Epson Stylus Photo 810 (M)
     print.printer_Epson_Stylus_Photo_810_(M).print_bgcolor: false
     print.printer_Epson_Stylus_Photo_810_(M).print_bgimages: false
     print.printer_Epson_Stylus_Photo_810_(M).print_command:
     print.printer_Epson_Stylus_Photo_810_(M).print_downloadfonts: false
     print.printer_Epson_Stylus_Photo_810_(M).print_edge_bottom: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_edge_left: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_edge_right: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_edge_top: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_evenpages: true
     print.printer_Epson_Stylus_Photo_810_(M).print_footercenter:
     print.printer_Epson_Stylus_Photo_810_(M).print_footerleft:
     print.printer_Epson_Stylus_Photo_810_(M).print_footerright:
     print.printer_Epson_Stylus_Photo_810_(M).print_headercenter:
     print.printer_Epson_Stylus_Photo_810_(M).print_headerleft:
     print.printer_Epson_Stylus_Photo_810_(M).print_headerright:
     print.printer_Epson_Stylus_Photo_810_(M).print_in_color: true
     print.printer_Epson_Stylus_Photo_810_(M).print_margin_bottom: 0.275694459676743
     print.printer_Epson_Stylus_Photo_810_(M).print_margin_left: 0.275694459676743
     print.printer_Epson_Stylus_Photo_810_(M).print_margin_right: 0.275694459676743
     print.printer_Epson_Stylus_Photo_810_(M).print_margin_top: 0.275694459676743
     print.printer_Epson_Stylus_Photo_810_(M).print_oddpages: true
     print.printer_Epson_Stylus_Photo_810_(M).print_orientation: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_pagedelay: 500
     print.printer_Epson_Stylus_Photo_810_(M).print_paper_data: 9
     print.printer_Epson_Stylus_Photo_810_(M).print_paper_height: 11.00
     print.printer_Epson_Stylus_Photo_810_(M).print_paper_size: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_paper_size_type: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_paper_size_unit: 1
     print.printer_Epson_Stylus_Photo_810_(M).print_paper_width: 8.50
     print.printer_Epson_Stylus_Photo_810_(M).print_reversed: false
     print.printer_Epson_Stylus_Photo_810_(M).print_scaling: 1.00
     print.printer_Epson_Stylus_Photo_810_(M).print_shrink_to_fit: true
     print.printer_Epson_Stylus_Photo_810_(M).print_to_file: false
     print.printer_Epson_Stylus_Photo_810_(M).print_unwriteable_margin_bottom: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_unwriteable_margin_left: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_unwriteable_margin_right: 0
     print.printer_Epson_Stylus_Photo_810_(M).print_unwriteable_margin_top: 0
     privacy.donottrackheader.enabled: true

 Graphics

     Adapter Description: NVIDIA GeForce GTS 250
     Vendor ID: 0x10de
     Device ID: 0x0615
     Adapter RAM: 1024
     Adapter Drivers: nvd3dum nvwgf2um,nvwgf2um
     Driver Version: 9.18.13.4144
     Driver Date: 2-3-2015
     Direct2D Enabled: true
     DirectWrite Enabled: true (6.2.9200.16492)
     ClearType Parameters: ClearType parameters not found
     WebGL Renderer: false
     GPU Accelerated Windows: 1/1 Direct3D 10

     AzureCanvasBackend: direct2d
     AzureSkiaAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: direct2d

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.10.6
     4.10.6

     NSS
     3.16.2.3 Basic ECC
     3.16.2.3 Basic ECC

     NSS Util
     3.16.2.3
     3.16.2.3

     NSS SSL
     3.16.2.3 Basic ECC
     3.16.2.3 Basic ECC

     NSS S/MIME
     3.16.2.3 Basic ECC
     3.16.2.3 Basic ECC

I have now worked through the steps in the diagnostics page and I still get the popup in a new profile. Does this mean that the problem lies outside Thunderbird with my firewall or antivirus?

You said it "appears every time I download emails"; so is it when you click on an Inbox, or when you open an email?

I see you have three accounts. Does happen on all of them, or just one?

go to Options -> Advanced -> General -> Config Editor -> Yes, you will be careful and find 'accessibility.typeaheadfind.flashBar'. Set it to 'default' (which I think is a 1). Close that screen and click OK. Restart TB. FYI: I check my setting: default 1; I checked my wife's Win 8: user set 2; and yours is user set 0. !?!

It comes up once every time I click 'Get Message' and everytime Thunderbird automatically checks. I can not tell if it is all the accounts but it is definitely the main one, waitrose.com. I rarely use the plus.net account and never have used the mozilla news account.

I will go and change the config editor in a moment.

I just set that line to 1 and it did come up default. Still the same screen when I sent a test email.

That was just a 'shot in the dark'; I didn't think it was related.

Just to confirm:

1. you've run with AVG disabled
2. you've run with add-ons disabled
3. do you have any special TB themes set?
4. do you have any Windows accessibility options set?

I don't see how your firewall could affect it. Beyond this, I think it's time to call in the "big guns" ;)

Your help and persistance has been amazing, thank you.

I've just checked again with AVG disabled and this time the screen didn't appear. I've done it twice because I couldn't believe it the first time and it still didn't appear, so I have a problem somewhere with AVG and Thunderbird.

Do you have any ideas?

Many thanks Helen

That is getting outside my area of expertise. Maybe Matt or one of the others can help.

Best wishes.

Thanks for all your help, because of it I looked closer at AVG and found I could turn off tray notifications for the email scanner. Having done that I no longer get the annoying popup.

A solution of sorts.

Many thanks Helen