blank overlay, sound and subs running ok, latest drivers on

[pweasel]

Hi all,
Here's my configuration:

BSPlayer 1.00 b810
Nvidia GForce2 drivers 6.14.10.6177
DX9
Windows 2003
DivX 5.2.0

when i try to see an avi file with any DivX/XVid codec version, i get a blank overlay (both window and fullscreen), if i do options>video>video controls it fixes itself (without me touching any slider).
in the overlay portion of the NVidia driver controls, i find that the HUE is set to 16836% and saturation is 44101%. this values are ser to this every time I double click an AVI. I can see everything ok if i turn on either VMR9 or RGB overlays.
Any ideas?
regards,
Marco

[pweasel]

I uninstalled FFdshow and everything worked fine. What is that filter and what does it do?