Did you already try e.g. a different rendering mode?
You have this weird problem irrespective of type of video?
What filters/codecs does BSPlayer use for playback of a problematic file?
To find out: (with a video loaded) rightclick > Options > Filters > Advanced
Then click on Source and on the [+]-signs in front of the codecs/filters shown.
Doing so will reveal further info and access.
