For some reason when Real One Player is open StrokeIt doesn't work. I'm running Win98, StrokeIt version 9b9 and Real One Player version 2.0 Build 6.0.11.818, I'm not sure if that's fixable but I thought I'd let you know. I didn't find any other posts on the topic.
In my situation, StrokeIt doesn't work when Real One Player plays avi file in fullscreen mode. But it works in both normal and full screen modes when media file is rm format.