Prior to the recent update, i could tab in and out of the game. Now i can't tab back in, which is quite painfull to realise when you're winning the round
A quick work-around is to push alt+enter instead. This makes your game change to windowed mode. Simply push alt+enter again to go back to full screen. Only problem I noticed with this is that it screws up my resolution. I have to go into the options and (without changing anything) click accept for my resolution to be correct again.