Well, I'm experiencing the same problem.
Subtitles could only be seen in OverlayMode1, which sucks, cause I could not minimize or move other window over the bsp's window, video freezes.
I was not able to display any subs on TV in OverlayMode2(same for VMR) using BSP only.
VobSub used to work for some time, but starting today BPS doesn't load it anymore :evil: , even though I put
Code:
AddFilter {9852A670-F845-491B-9BE6-EBD841B8A613},DirectVobSub
into bspfilters.sam.
BSP support for subs in Overlay Mode 2 would be a great thing to have.