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I think in a couple of weeks, I had some problems with 9.11 ie in crysis games at 24hz and nba 2k10 at 50hz. I contacted them and someone there said these problems should be fixed in 9.12 and to use 9.10 until these are released.
Have you tried adding in supported modes in the HDTV bit of CCC? Can't remember exactly what it is called as not in front of my PC at the moment. But I used this in the past to fix some DX10 games that wouldn't seem to run at 60Hz properly.