Have you the cdrdao package installed, and is it seen by k3b ?
Also you could use cdrdao to copy CDs from command line :
1. Identify your CD rom and your CD writter
2. Copy the CD
Code:
cdrdao copy --device $CD_WRITTER --source-device $CD_ROM
(replace $CD_WRITTER and $CD_ROM with the values that cdrdao scanbus
gives to you)