I had the same problem when I first agreed to the new license but quit the application before login. In the application support folder (~/Library/Application Support/SourceTree) there was a json file named "20160217_<some uuid>.json" containing something between 5 and 6kb of binary data.
I renamed the file and restarted the application and the login page was visible again. I am not sure whether there is any relationship between this file and the login page. Maybe pure coincidence... But after that a was able to login and use sourcetree again normally.
Hey team! I'm Cameron Deatsch, Head of Server at Atlassian. I'll be hosting an AMA over in our Questions section of the Community next Monday, so shoot me your questions, upvote others' question...
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