Crash after entering Atlassian account details

I had just downloaded and isntalled the latest version of Sourcetree. I was asked to enter my Atlassian account details, which I did, but was then told my password expired. I clicked the password reset button, got the email, entered a new password, then returned to Sourcetree and logged in with my new password. I saw the confirmation screen that I was successfully logged in, clicked the OK button and the application immediately crashed.