I've got a similar problem here but only using full screen mode.
If the video is on window mode (not full screen), it is playing fine.
I've already re-installed CCCP and BSPlayer but the problem remains.
Other players (for example media player classic) don't reproduce the problem.
EDIT: My problem is related with subtitles and it is exactly the same as explained in this thread:
Problem with Fullscreen and subtitles