I updated SourceTree on my Mac. Now I cannot get past the initial setup screen tying it to my Atlassian account. I hit the "Use an existing account" button and get a tall, narrow and very blank window. If I hit the "Go to My Atlassian" button, it prompts me to create a new account. Hitting the "Use existing account" link gives me a 404 error.
How do I get past this or go back to the previous version of SourceTree?