Uh... This seems to be interrelated to how Ubuntu chose to automount the CD/DVD device. Problem occurs in more than just k3b/wodim. AcetoneISO doesn't work right. Other burning programs don't seem to work right. PSXE can't see legitimate PSX discs with this problem. Didn't occur with initial rollout of 12.04- but seems to have been triggered later on somewhere with one of the updates. If you explicitly unmount all mount instances of /dev/sr0 (mine had TWO differing, problematic mounts which explicitly referred to uid/gid) and things work properly for all instances- so long as you don't work with the "automatic" mount of the disc.
Basically, if it's not just a file tool or using the basic /media mount, you're dead in the water with any of it unless you explicitly UNMOUNT it and you need sudo access to do it with.
Uh... This seems to be interrelated to how Ubuntu chose to automount the CD/DVD device. Problem occurs in more than just k3b/wodim. AcetoneISO doesn't work right. Other burning programs don't seem to work right. PSXE can't see legitimate PSX discs with this problem. Didn't occur with initial rollout of 12.04- but seems to have been triggered later on somewhere with one of the updates. If you explicitly unmount all mount instances of /dev/sr0 (mine had TWO differing, problematic mounts which explicitly referred to uid/gid) and things work properly for all instances- so long as you don't work with the "automatic" mount of the disc.
Basically, if it's not just a file tool or using the basic /media mount, you're dead in the water with any of it unless you explicitly UNMOUNT it and you need sudo access to do it with.