Cannot login to SourceTree

Try quitting the SourceTree app and re-launching.

I had a similar problem. My id.atlassian.com credentials worked online but repeatedly failed in SourceTree. It worked for me after a relaunch.

Atlassian recommends sticking with the older version at the moment: https://twitter.com/sourcetree/status/699624992003244033

Update On Feb 22, Atlassian apologized and released SourceTree 2.2.2. However, some folks are still tweeting issues with the initial login on the release announcement.