I'm using Lightning 3.3.3 in Thunderbird 31.4.0 on Ubuntu 14.10. Because the Mozilla support sites seem little frustrating to me, I'm asking about it here.
But it seems that Lightning isn't working for me because of a major error. I don't know what the error is, but I can post two screenshots showing what it looks like:
and after changing the tab and switching back it looks like:
I already reinstalled it, but without change. It's not possible to work with it or create any new calendar (for example). What went wrong? It's really eating my nerves.
I found a solution, but quite accidentally.
Removing all extensions and reinstall Lightning didn't help. I tried to change the language of Thunderbird, which didn't help too. I also installed version 3.3.4, no change. Then I tried to import a calendar-file (.ics), it loaded but didn't show anything (that's how I expected it). But then I reinstalled Lightning and the calendar shows up and is working. I didn't expect that to be possible, due to a probable loss of all Lightning configuration, but somehow it worked.