I think it's a feature.
Since you can enable DS filter by editing some Config file, they are prolly working on an GUI interface for that...
But for now try this:
Create a file "bspfilters.dat" in the directory where bsplay.exe is located with notepad and this content:
Code:
[BSPlayer filter def file]
; Filters that are always loaded
AddFilter {9D2935C7-3D8B-4EF6-B0D1-C14064698794},DivXG400 Check the sample file "bspfilters.sam" included in the latest release for more info..