Can't use screencast program with Impress

I need to make a video of Impress, but none of the screencast programs I’ve trued work. The first screen looks okay, but as soon as I advance to the next one, half of the first screen still shows on the video (although it changed fine live). There’s just a black hole that doesn’t update, or at least not well.

Since I’ve tried several screencast programs and get this same problem, it’s either a quirk of Impress’ full screen function or else a quirk of my graphics card. Any help? Using Linux Mint 14.

@KevinP1 - Are you still interested to get an answer? If so, it might be good to provide a bit more information to enable others to fully understand your situation.