Gutsy won't write DVDs

[Dave M G]

Ubuntu Users,

I reported this problem on the forums, but it has seen no response:
http://ubuntuforums.org/showthread.php?p=3588300

I have a CD/DVD r/w drive, that burned DVDs in Edgy and Feisty.

Basically, in Gutsy I can burn CDs no problem.

But I can not write DVDs at all. Any attempt to do so results in being 
asked to insert a writable disk. This happens regardless of what program 
I use, K3B, Gnomebaker, or others.

Any advice would be much appreciated.

Thank you.

-- 
Dave M G