Do you use the Calendar addon ?

In another forum question Wayne Mery reported:

Reports indicate this is caused by the Calendar addon, in conjunction with version 38.3.0.

For Windows, 1. install older version from http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/38.2.0/win32/en-US/Thunderbird%20Setup%2038.2.0.exe 2. remove calendar addon, restart thunderbird 3. update thunderbird at help | About 4. reinstall calendar addon

Does that help?

I had already returned to 38.1 version, but I removed "Lightning"which was disabled anyway, so I will now try reinstalling 38.3 and hopefully, will have no more problems.

Thanks

How did you get on Roghil

Hi Matt,

I deleted the calendar add on and just went back to previous version of Thunderbird and haven't bothered to update. Thanks for your help.

Regards

Roger

Well now you have the instructions you can update to the more secure later version. Although hopefully 38.4 will contain the relevant fix to prevent this happening again.

I will just leave as it is for the moment.