I presume that you have the latest version .

Suggestion : clear thunderbird cache "manually" and then start it

The cache directory is in %LOCALAPPDATA%\thunderbird\profiles\<nnnnnnnn.default>\cache2

I am running Fedora. Where is the thunderbird cache located?

Thank you, Vince Radice

I don't have Fedora. I have linux mint and it's under ~/.var/thunderbird/*/

I found an item in settings to clear cache on exit. I set this and restarted TB. Now I can read some mail but then it hangs again while I am reading a message. I need to kill TB as it is still 100% cpu. Is there any way to determine what TB is trying to do?

Do you have very big folders such as Inbox of GB size? Create an new profile, set up your main account and see what happens.

You may want to limit the size of the cache directory to see if it's help.

The option is right below the "Clear cache on exit" . Check option "Override automatic cache management"

vhradice

Please try the following and post your results:

• Help > Troubleshoot Mode
• Disable hardware acceleration in Settings.

I had copied mail to a different computer and not all files were copied. I copied them over and all works.

Have you had a look at bugzilla: [https://bugzilla.mozilla.org/show_bug.cgi?id=1977514]. I know this is for OSX but may be the same issue ??

vhradice,

If you Enable hardware acceleration in Settings, the problem returns?