After updating to 9.10, I wasnt able to Burn CDs in Brasero or in K3b. I would get an error in K3b that said
"cdrecord has no permission to open the device"
And in Brasero I was getting an error that said:
"the medium is not writable with the current set of plugins"
I did some googling and found that I needed to change the permissions to my CDROM folders.
so ran these commands
chmod 777 /media/cdrom1
chmod 777 /media/cdrom0
chmod 777 /dev/sr1
after that i was able to burn!
Well, the above corrected burning ISOs but it still did not let me burn MP3s to CD.
See this post
http://www.digisal.com/smf/index.php?topic=664.0