I had the same problem running from CD. I logout from X and the session shuts down and I'm back at the colored text boot screen (what's a green dragon?). Next thing you know the boot screen says it's sending all processes the TERM signal, then (IIRC) the KILL signal. Shortly thereafter the CD ejects and I'm told to remove it and hit [ENTER]. When I do, the system powers down. Man, I just wanted to log out from knoppix and back in as root!