Sound driver might be an issue if a class of videos hung no matter if subtitled or not, because video gets its framerate clock based on sound output. (This produces jerky video, but that's how it is.)
However, in this case the problem indeed localizes in BSPlayer. Or perhaps in the way how BS talks to the video driver; because with some drivers the subtitle OSD does not work properly.
I run ATI Radeon RV370 (Catalyst dated 2006-12-16) on my multimedia computer.
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