I need some help. I started using Thunderbird a few months ago. Lightning was installed day-1 but has not been used as I favor a very old calendaring program called WinDa… (read more)
I need some help. I started using Thunderbird a few months ago. Lightning was installed day-1 but has not been used as I favor a very old calendaring program called WinDates. Today I exported my WinDates calendar to .ics and tried importing it into Lightning using the instructions for adding a Holiday calendar found in the KB. It was very straightforward and should have worked perfectly -- except it didn't. It caused Thunderbird to hang. Force-closing Thunderbird & relaunching failed. Force-closing then restarting the computer & relaunching failed. Force-closing then doing a cold boot & relaunching failed. Force-closing then relaunching in SAFE MODE (thank you, KB!) got Thunderbird running again. Disabling Lightning and restarting in normal mode showed Lightning to definitely be the culprit. I removed Lightning & relaunched Thunderbird in normal mode and all was happy. Then I re-installed Lightning and restarted Thunderbird at which point Thunderbird hung -- again.
So I am thinking there must be something in the .ics file that is messed up (it's only 248 kb) or something fouled in a cache file that Lightning left behind.
Any help and/or ideas will be gladly appreciated.
So I've got Thunderbird working, but Lightning continues to be a problem. I thought the issue was the add-on Lightning extension, but now I know it isn't; it's the built-in Lightning. When I go through the steps here (Calendar Updates Issues Thunderbird) Lightning is there as it's always been, and hangs just like it did when I first tried to import the .ics file.
I did find a temp cache folder at C:\Users\myprofile\AppData\Local\Thunderbird\Profiles\nwipuw2i.default-release\cache2\entries which has 20,976 files of varying sizes, but I dare not delete anything unless I know what is safe and what is not.
My only work-around right now is to disable Lightning.
Windows 10 Pro x64 v1909