Edited by BSPeter: note I moved previous post from this thread: http://bsplayer.com/forum/viewtopic.php?t=13332
The file was in a multi-volume archive and of course, it played correctly after opening the archive. Now, someone cam move this post from bug reports to fun stuf, as the file was MP4 and I use Gabest MP4 splitter. Even if Haali it's installed on my system, it's used only for MKV not for MP4, AVI and so.
Still, from my point of view, it seems that BSPlayer is somehow forcing us now to use Haali.