A new CAP has been released, you can grab it here from our friends at Rage3D.
Uninstall any other CAP installed and install this new one, then create (or modify) a profile for Crysis2.exe, choosing F.E.A.R. as CrossfireX compatibility profile. Doing that will fix the flickering seem on Crossfire systems and will improve performance as well!
Give it a shot now!!