The subtitle OSD screen might also be video driver dependant, not just muxer-splitter combo. I recently setup a Win98 computer with integrated Intel Extreme graphics. I installed the regular trusted set of codecs (Haali, ffdshow beta3, ac3filter 1.01a). The computer has several display problems with DirectDraw games and also subtitles in BS do not work properly: can't be positioned, are not transparent, cropped.
Resorted to drawing them to video using ffdshow. Thankfully the comp is fast enough for that.
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