This is a strange one to me. Just recently, my Centos 6 has been "gentle crashing" where it doesn't crash, per se, but the screen goes black, and the login prompt pops up. It only happens when I run Firefox and it only started happening this morning. However, it has happened a dozen times, and always when Firefox is running. It does NOT happen when Firefox is not running. I haven't tested with Chrome yet; so that's my next test - but - the question I have is: How do I log the events that are causing Centos to log me out of user1 and to present the login screen?