Read this post http://www.knoppix.net/forum/viewtop...=12067&start=0
for workaround.

The problem came from knoppix-autoconfig....it's a bug, I believed.
This problem usually occurs to someone who use knoppix beginner or knoppix- like hdd installation. This type of installation will let knoppix autodetect your system everytime it boots and resetting lots of thing.

If you try Debian-like hdd installation, this problem might dissapear.