User Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:41.0) Gecko/20100101 Firefox/41.0 Build ID: 20151017161446 Steps to reproduce: I think this happens mostly after sleep-mode. Actual results: Thunderbird hangs (it's not responding). If i open another instance it tells my that Thunderbird is already running. System is Linux mint 17.2. I have this issue on several computers/notebooks and it happens after the last update (from 38.2.0 to 38.3.0 i think). Expected results: Thunderbird should not hung.
Is this still failing for you with 38.3.0? And if it is, does the beta from https://www.mozilla.org/en-US/thunderbird/channel/ do any better? (the beta will provide a different version of calendar)
Ähm, it is a little bit strange... I had this problem on different clients. But after reporting this bug it never happens again! Don't know why. :-S I like to test it a few days/weeks more, but until now it seems the problem is solved.
Please reopen the bug if you see a change.