vobsub subtitles in matroska files

hey, i have a matroska file that has vobsub subtitles in it (the entire file has xvid video, he-aac audio, and vobsub subtitles, muxed together w/ mkv-merge gui). i also have vsfilter 2.33 installed and registered successfully, but for some reason direct vobsub never loads with this file

i'm thinking bsplayer isn't reading this stream correctly (or something) and passing it on to direct vobsub.

direct vobsub is working fine cuz i successfully played an .avi file that had separate .idx/.sub files and they played fine



i'm using bsplayer v1.00 build 810