i have same problem like yours usualy if have any eror line masages for sub or srt file just open the file find line ane replace delete info with similar to other line save buton then start sub file again
my problem is different only 1 file have this problem just not show srt file into menu with vlc plaer work without problems....
seening this problem befor 2002 and from time to time ..sry for my eng .. not needed usualy .
bsplayer work like not have sub file in same folder with exact same name like video i grab file and put it on video window .. same situation .... anybody know how to fix this ?