I have this issue with WMA tracks using 9.5.1. It affects some of the tracks and not others, but I dont know why. Here are two sample files:Track 9 (off by 1).wma (5.27 MB)Track 10 (correct).wma (5.98 MB)
First of all, I'd get those files offline ASAP if I were you, at least remove the links, since they are violating the TOS of hydrogenaudio.org (they are copyrighted material, and as far as I know, you don't own the copyright to Blue Öyster Cult).
Second, there is no bug in foobar2000, or then there is one in Windows Media Player as well.It seems that teh tag in them has a tracknumber of 10. It doesn't matter what the filename is if you've tagged them wrongly.