The release notes for CentOS 6.4 state as follows: > With this release the ABI for the X.org video drivers changes, > possibly resulting in a failing X-Session. If you are running 3rd > party drivers - i.e. vBox addons, nVidia, ATI or ELRepo - you need to > ensure a compatible driver is loaded. I use flgrx from ELRepo. Does this mean that fglrx is now incompatible with CentOS? Yves Bellefeuille