I've downloaded the install file for Sourcetree and gotten to the "Log in to your Atlassian account" page, but when I use either "Use an existing account" or "Go to my atlassian", I get stuck on a "Please Wait" screen. I've tried changing my password just in case that was the problem, but no luck. I can log on to my account via the website with no problems, but just can't access it via this screen so I can't go any further. Please help!