I haven't had any problems since the first time.
In the testing which I just did, I noticed no problems until I started Thunderbird during a downgrade. This created a rogue process which kept either version of Thunderbird from starting. I was able to reproduce this several times. It happened if I attempted to start it while dpkg was upgrading as well. I am not sure how this is related but it is a similar issue. There still seems to be a possibility of leaving dead processes around under various uncommon circumstances. It is indeed quite possible that the bug which caused it to leave such a process around in my first case has been fixed.
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