I've successfully enabled it and even managed to record a couple of short videos, like 1 minute long. But each time I try to record something longer, like 10 minutes, it just fails miserably. All I get is one minute of perfect footage, then sound starts stutter, disappears and then it stops, after like a minute and a half. I literally get 1 and a half minute long videos after recording for like 10 minutes or so, with no errors reported by Action! whatsoever.
Was trying to record so far:
Dota 2 (highest settings)
Starcraft 2 (medium to high settings)
Batman: Arkham City (DX11, without tesselation and physics)
All along with my voice. And the result is all the same every time. My system specs:
Core i5-3750@3.40GHz
MSi nVidia GTX660 oc 2G
8G RAM
WD Caviar Black
Windows 8 x86_64