My question is similar to that of jojopara.
I downloaded V3.2-2003-09-05-EN.
I ran K3b setup as root and added a user called Knoppix.

I was able to burn a CD as root, but as user, I was unable to do so.
As user, K3b could not find my burner device, and was unable to find the program cdrecord.

As root, I was able to burn a cd, and I am now posting this using the Live version of V3.2-2003-09-05-EN.

Am I using the wrong name for "user" in K3b setup?
On a somewhat related note...

DUH...How do you mount a data CD as user? I am only able to mount audio CDs. I obviously have a lot to learn about Linux.