I recently got the nonfree nvidia drivers using the driver manager in ubuntu studio because I had performance issues with nouveau. At first everything was working like a charm but then I tried to use multiple monitors which would completely crash the system taking me to the splash screen. the next time I try to log in to my main account the screen goes black as though it were about to load the session than it resets to the login screen. I can login using a tty terminal to the main account but not on the display manager. I think this could be xorg I am not sure. Also somehow the guest account works fine. Even multiple monitors work on guest account. I hope I get help soon. I got no reply for 10 hours on the ubuntu studio forums. I find usually smaller forums like this one are more reliable. P.S. This crap happens a lot with my card it's an nvidia GeForce 310 M on a laptop. Very bad card even benchmark wise. But it's all I have really.