That's known issue (for players at least)
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Well, I have a good news for you guys. After game start, always check Q/E keys or backspace on chat. If they don't work, you can easly fix it by... alt-tab out of the game and alt-tab back to the game. All will be fine then. The only thing you will lose after this, is distance of skills - skills distance red circles will dissapear i'm affraid
. Still it's much better this way than playing with bugged camera/backspace/char control keys...
This bug sometimes happens when you alt-tab in lobby before game start, and the game (God knows why) won't refresh after alt-tab in right way. Oh, and when you are bugged, backspace key won't work in lobby too (so you can check in lobby if you are bugged even before game start). I have a habit right now to always check backspace key in lobby after alt-tab. If it won't work, just alt-tab again and check it again.
BTW: NEVER alt-tab out of the game when the map is loading - game likes to crash then !!