Can you tell us about your blender scene a bit? I noticed this problem too on one of the scenes I was testing last night (rigged animation with cloth sim). I didn't have too much time to dive into the problem as it was pretty late, but I will be working on it tonight. Every other scene I've tried has worked fine so far. Please tell us about your system, which blender version you are using, which python version you are using, etc. This could help.
System 1: EVGA gtx470 1280Mb and MSI gtx470 1280 in Cubix Xpander for Octane, AMD 945, 4Gb Ram
All systems are at stock speeds and settings.