I assume you have tried clicking on the game a few times? The most common reason for a game not responding to keyboard input, is if you accidentally click outside the flash window...
If this is not the case with you, I don't know what it could be. Which games are you having troubles with?
The most common reason for a game not responding to keyboard input, is if you accidentally click outside the flash window...
That's called losing the focus! But yeah the new flash player needs you to be focused on the game for it to sense buttons, sortoff a security measure in a way, can't play multiple games at once.