Perhaps you should first upgrade to the latest version/build, which is 86 build 501.
(Install 500
http://www.bsplayer.org/dlfile.php?s...lay086.500.exe
and subsequently place the two substituting files and 1 additional file of build 501
http://www.bsplayer.org/dlfile.php?fname=bsplay.zip in its installation directory).
If you then still have this problem it will probably be related to the codecs used.