I just tried to update from 4.1.2 to 4.1.8. I can't click on one of the repos in the repos list to open without causing the app to crash. The repo window that is open when the app starts up seems to work.
I've read that deleting the sourcetree folder in `/Library/Application Support will solve the problem, albeit with the added inconvenience of rebuilding the whole repo list again by hand.
I may experiment by stashing the file with all the repo address stuff in it, to see if I can just restore that file.
