When using DX11, Crysis 2 always uses the lowest refresh rate of my monitor or TV.
I use a 120Hz monitor for gaming and every game works with 120Hz incl. Crysis 2 DX9.
I also use a normal 60Hz HDTV and every game works with 60Hz incl. Crysis 2 DX9.
BUT in DX11 Crysis 2 forces 60Hz on my monitor and totally unplayable 24Hz on my HDTV.

Using ALT-ENTER to get in and out of the game doesn't fix the problem.

Does anybody know how to fix this mess?

Thanks for any helpful suggestions.

Just put fullscreen option OFF, apply, exit game. Restart game and when u see EYE cryengine LOGO press ALT + ENTER, resolution change to 1600x1200@60, and that just wait, next resolution change again for 1920x1080@60HZ, than play=)