Sudden DVDCSS error on AVI files

[Dale_K]

I have a bunch of avi files that I've had on my server for a few months and always worked fine.  All of a sudden I'm getting DVDCSS errors when I try to play some of them.  As far as I can tell about 50% of them still play just fine, the other 50% get the error.

I've tried re-installing dvdcss using apt-get and it seems fine.  Retail DVD's both still play fine and rip fine.  The problem only occurs with avi files and all of them use to play without a problem.

So, where do I start troubleshooting?