2nd try on getting some help.
first time I started game crossfire was working fine getting 60-80fps at start of the game.
just testeda bit before work.
later that day crossfire just stopped working, 2nd card utilisation is 0!

it works perfectly with other games but just Crysis stopped using 2nd card.
I did upgrade from 13.2 beta 5 to beta 6 drivers, adding r_MGPU = 1... nothing works.

Any idea? How can it just stop working...
I also reinstaled whole game as well and no luck at all.

help please! weekend is too short and gotta get back to work this is ruining my whole weekend plan...

OMG you won't believe it...
stupid teamviewer was the problem!
after killing it everything works fine...

I remembered that BF3 had similar problem where it just couldn't go into real full screen... looks like same problem here as well .

anyway, if you have teamviewer running KILL IT!