When using the Prevent window deactivation feature I can only get it to work if I tab out then back into the game i'm playing. Also when I tab out and back into the game my alt key stays pressed. (My computer thinks i'm holding the key down but i'm not.) Is there anyway to fix these problems?

(Also, I know the alt key is stuck as if i'm holding the key down because my keyboard light up the keys I press then after about two seconds the light fades. But when I alt tab using while the window deactivation feature is enabled the alt key stay lit up.)