Every time I notice the

Every time I notice the brightness flashing I get out of MC and check CC and the dynamic contrast is still off.  What is throwing me is it is only certain channels and some programs on those channels flash more than other programs.

I noticed it quite allot on the Discovery channel this weekend, particularly during Storm Chasers while watching in my living room.  I recoded the program with my bedroom HTPC and it flashes when viewing the recorded program on the Living room but not the bedroom HTPC. Both with 5450s but the bedroom is using CC 11.2 while the Living room is using CC 11.8.  Should I uninstall 11.8 and try 11.2???