I'm also getting a black screen when trying to log in.
Yes, I've logged off remote sessions.
Yes, I've closed and re-opened my browser.
Yes, I've cleared cache.
Yes, I've restarted my computer
Yes, I am extremely frustrated, annoyed and disappointed.
Further to the above, I've received meaningless and useless error messages, viz:
"No ticket for this user." and
"Server Busy This action cannot be completed because the other program is busy. Choose 'Switch To' to activate busy program and correct the problem. Switch To... Retry" Neither of the buttons did anything when I clicked on them.
What a waste of valuable time.