Erii, if you're trying to record your games n fullscreen using a hotkey to start recording, then you and I are having the same problem. I've yet to fix it, due to only recently encountering the problem. I'm also disuaded to solve this because I know that Debut doesn't do my games justice in terms of quality.
However, in another thread there is talk about how games are run in an overlay which isn't detected by Debut and some such.
http://nch.invisionzone.com/index.php?showtopic=14618
If you find a solution to this problem and can post it, or if anyone else can assist in a more effective manner I'd love to hear it.