Screen turns black whenever I try to switch users

I will provide the info as soon as I get home, however I think It’s the same problem/topic described here: System freezes when switching users - #12 by soundofthunder
First I made sure Start with an empty session option was enabled

However As NickTouik described is his post

  1. Logging in as user A.
  2. As user A, switch user → Brought to the login screen → Select and log in as user B.
  3. black screen.
  4. Press ctrl-alt-F1 or F2 and It takes some time to be able to log in in terminal session… sometime its not even possible and I have to press different Fx keys to switch back to user A and try to restart or shutdown the system, if it’s not frozen
    I can log in perfectly with user A or B, the problem is when I try to switch between users. I don’t know if my english let me explain the problem clearly