Problem with the catalyst driver

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http://forums.fedoraforum.org – Hi, I installed steam when I was using the radeon driver and the steam client works ok. So I installed the catalyst driver and when I try run steam the screen turns black and the system go to gdm (not even running in the terminal to see what the error is) . I try run urban terror and the same error occurs. Anyone have idea what's happening? Fedora 18 x86_64 Radeon HD 6570 I appreciate the attention. (HowTos)