Why is it DOING THAT ><

Okay. I am *trying* to take screencaptures of a .wmv using MPC, and before today I have no trouble at all. So I'm trying to save an image of a very specific frame, right? Only it keeps saving one frame about 4 frames in reverse. So naturally it's making it somewhat difficult to do this, not to mention I now have a directory full of copies of the exact same frame.

I AM GOING TO KILL SOMEONE.

EDIT: Okay it is actually saving images one frame BACK from the frame I am trying to save, so if I move one frame forward from the one I actually want, I can save it. I got what I wanted, but I'd still like to know why it's doing that and what I can do to stop it, as that is going to make creating animated gifs a huge pain in the ass.

Jam it back in, in the dark.