Thunderbird does not startPosted: July 21, 2017
This may happen after a crash.
Problem: You attempt to start your Thunderbird, but its GUI window does not show. You can see it running as a process in the background, but nothing else happens.
Cause: The problem may be caused by a surviving lock file in the user profile directory.
Solution: Navigate to .thunderbird in your user directory, select the appropriate profile directory and delete or remove file .parentlock therein.