Version:           0.11.14 (using KDE 3.3.0,  (3.1))
Compiler:          gcc version 3.3.4 (Debian 1:3.3.4-9)
OS:                Linux (i686) release 2.6.8

Under kernel 2.6.7 k3b see my drive (TEAC CD-W524E 24X 10X 40X) writeability under ordinary user and root and , of course I can write CD. 
When I have started kernel 2.6.8.1, I can see my drive in CD-ROM section only and so I cannot write CD. 
All permitions correct. If I start k3b under root all working without any problem.

Difference in properties of CD drive is:
under root:
Write CD - yes
Write CD/RW - yes

under ordinary user:
Write CD - no
Write CD/RW - yes

I think so this is cause of my problem.