assetto corsa amd r9 290x

I play assetto Corsa. I have right now: CPU: i7 5930 3.5Ghz Three gpu cards of R9 290X (Not running CrossFire. Most games just don't support it.) Assetto Corsa use to, I had my rig running. Now it stopped and only one card is used. Not even an option to turn CrossFire back on. I was getting...