Login screen issue

Hi, just a issue I cant seem to find an answer to...everything has been loading and playing fine up until maybe 3-4 days ago when after that every time I try to load the game it makes it up to screen where you can select start, data center, movies and title, etc. but at this screen the mouse cant select any option at all...its like an invisible wall has placed itself between the game screen and my mouse.

I have reinstalled but to no avail, the problem still persists...no idea why out of the blue it would do this, especially after a clean install.

Any help would be greatly appreciated as this is chewing into the remainder of my game time :)

The screen maybe losing focus, you can try holding down the ALT key and pressing Tab to change focus, have a browser open prior to logging in, then Tab the game window again.
Also can try hitting the Enter key if the mouse still wont work, on the Title screen etc.