Similar problem here, but was already reported with old versions:

http://forum.bsplayer.org/viewtopic....ht=ati+overlay

ive been testing with different combinations and found that lastest ATI drivers with:

-FFDshow codecs:
Overlay mode1 = no overlay mode enabled (surface type = YV12 DR), and dark colors.
Overlay mode2 = black image (surface type = UNKN), colors can be reset to normal mode with overlay controls of ATI control panel, but return to black if you open/close/change grafic settings of a movie.

-Other codecs:
Overlay mode1 = no overlay mode enabled (surface type = YV12 DR), and dark colors.
Overlay mode2 = works ok with correct colors and overlay enabled (surface type = UNKN)

behaviour with RGB and VMR-9 is same with all codecs, no overlay mode and darker colors.
All confings are tested under Win2K and 2K3, the only temporal solution that ive found is run my videos with WMP9 that is giving me better color quality but sadly without all the extra options of bsplayer and sometimes crashing like hell ><
Ill really apreciate if you can fix this bug that seems only affect ATI users with lastest divers version and ffdshow.

thx