[X4U] massive iTunes corruption

[joshua hough]

My iTunes library contains around 10,000 MP3s.  Latest version of iTunes on Jaguar.  Starting recently, occasionally the wrong MP3s are playing.  Or sometimes the correct one plays, but part way through it starts playing part of another file.  The problem is not the library file itself.  Playing the actual MP3s in RealOne or QT Player shows that many of them are severely hosed (randomly spliced together with different MP3s).  Last-modified dates show they've been modified very recently.  Even ones I haven't touched in years.  There is no evidence of damaged volume structures.  TechTool Pro and DiskWarrior diagnostics pass 100%.  This is very bad, so two questions:

1.  Has something like this happened to anyone else?  If so, how did you overcome it?  I can restore the files from a recent backup, but some backups might still contain bad files, and I don't want to continue future backups if I'm backing up garbage.

2.  Potential cause?...  Recently I added another hard drive and installed Panther and the latest iTunes.  Occasionally I boot from the Panther drive.  Instead of having a second iTunes library, I replaced the /Users/xyz/Music/iTunes folder with an alias of the one from the Jaguar drive.  This sharing appeared to work just fine (playing/ripping/burning), but perhaps havoc was being wreaked secretly?

Thanks,
Josh