Cannot login to my account to view Remote Repositories

[Pen Tool]

When I go to SourceTree, my remote repositories don't show. When I refresh my remote repositories from SourceTree's Repositories Browser, I get a dialog saying "Refreshing Remote Repositories failed", and provides me a "Sign In" button.

After I sign in (correctly) to my account the sign-in page/window is blank and nothing happens. No spinning cursor, nothing. Just a blank window. (The attached screenshot is displayed AFTER I signed in to my account.)

This happens all the time I try to view my remote repositories.

SourceTree 2.7.6

OS X 10.11.6

[Pen Tool · Accepted solution]

I was trying to login using SSH, but SourceTree did not found my SSH key. My keys are stored in a folder other than in the system's .ssh folder, so I had to manually copy the keys to the ~/.ssh folder.

[Pen Tool]

Somehow I managed to receive this message when I tried to login for the 24t time.