I can not understand the problem. Previously crossfire worked. Most recently, instead of two video cards, I worked with only one. At this time there was an update 1.68.
When I started using two video cards - crossfair appeared in all games except Arma 3.
I tried all the options: standard profile, 1x1, afr.
Game in full screen mode.
Last video card drivers.
R9 270 in Crossfire.