After update, can only acces Thunderbird via sudo

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http://ubuntuforums.org – Hello, recently my Thunderbird has stopped opening as usual, I can only open it via the terminal "sudo thunderbird" command. I have looked on the internet for a solution but none seems to work for me... So far I have tried: - uninstall/reinstall - creating a new profile and moving mail - in desperation even "chmod -R 777 .thunderbird" (after I tried to chown -R with appropriate user:group) What bugs me is that I can remove/rename the .thunderbird directory the program starts OK without the need for sudo and I can create an new user. But as soon as I transfer my mail to the (Hardware)