I had the same problem when trying to register with TFS - there is no dialog box and the ESC escape key turned off the freeze.
Recently, before the problem, I changed the configuration of Laptop + Monitor as follows:
from the main screen, which is a laptop, and the second screen is a monitor
for the primary screen, which is the monitor, and the secondary, the laptop.
I got rid of my secondary screen and tried again. It is enough that the invisible dialogue is no longer invisible.
john