Unable to open folders beyond initial choice
This behavior started today. Thunderbird opens on the Home tab. I can choose an initial folder such as Inbox and messages are displayed. Tapping on any other folder does not change the emails display from the Inbox. Tapping on an Inbox subfolder leaves the emails shown unchanged. The only way to inspect another folder is to quit Thunderbird, restart, and the select a different folder first. No changes thereafter will be allowed.
الحل المُختار
If it works in safe mode, there are several possibilities: incompatible add-ons, including Lightning calendar (check that you have Lightning 5.4 on TB 52), broken layout or hardware acceleration.
Launch in safe mode and select 'Disable all add-ons' and click 'Make Changes and Restart'. If TB runs OK, you have an incompatible extension or theme, and it's a matter of re-enabling them one-at-a-time until the problem returns and the source is found.
If the problem remains when all add-ons are disabled, it is probably a broken layout or hardware acceleration. Disable the latter under Tools/Options/Advanced/General. To fix the layout, launch in safe mode again and select 'Reset toolbars and controls' and click 'Make Changes and Restart'.
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Does this still happen in safe mode (Help/Restart with Add-ons Disabled)?
In Safe Mode the program runs OK.
This may be related to the Calendar. When not in Safe Mode, choosing of the calendar states creates a calendar tab but the calendar itself is not displayed and the headers in the columns are flickering. The side panel of appointments cannot be activated.
Modified by BLFields
الحل المُختار
If it works in safe mode, there are several possibilities: incompatible add-ons, including Lightning calendar (check that you have Lightning 5.4 on TB 52), broken layout or hardware acceleration.
Launch in safe mode and select 'Disable all add-ons' and click 'Make Changes and Restart'. If TB runs OK, you have an incompatible extension or theme, and it's a matter of re-enabling them one-at-a-time until the problem returns and the source is found.
If the problem remains when all add-ons are disabled, it is probably a broken layout or hardware acceleration. Disable the latter under Tools/Options/Advanced/General. To fix the layout, launch in safe mode again and select 'Reset toolbars and controls' and click 'Make Changes and Restart'.
Something happened to Lightening. It was the correct version just broken somehow. Deleted and reinstalled and now all is working.