This has been a constant frustration for me. whenever i open a case and it views the card, my screen basically freezes and i have to alt+tab out then back in to the game, then it will show the screen. Same thing happens when i join a server and i lock in my mercs, i will click and it will work, but my screen wont change(not even the timer). same thing happens in the screen between games. the weirdest part is i have the fps counter enabled in steam and it says i have like 200 fps in menus but its frozen 
if you know what’s wrong or what to do, please tell me. thanks!
also i have nvidea geforce 940m videocard in an hp pavilion if that means anything to you because it doesn’t to me