strange zooming problem in bsplayer

Well, I've been using bsplayer for a while and I like it but all of a sudden, when I tried playing a movie today the picture I got seemed like en extreme close up of teh film. Peoples heads were cut out of frame etc. I haven't changed any of the settings and the file plays perfectly with Zoom player and wmp.
I've tried other files and they all have teh same problem with BS.

Any ideas?