Can't erase DVD-RW anymore

My MBP is refusing to erase DVD-RW discs anymore. I'm running 10.5.2 and it last worked (on this specific disc) under 10.5.1.
I've tried erasing a couple of discs, using both Disk Utility (quick and complete) and Disco. It appears to work properly, but it never finishes and comes up with the "You've inserted a blank disc" anymore. And when I go to the finder and click back on the disc, the original files are still there. I've also tried it before and after a full reboot with no joy.
Any ideas?

Have you tried Toast? I use it regularly to transfer files to and from work. I rarely have problems erasing a DVD-RW. I have Toast 8. Go to the Recorder menu in the application, insert the disk you want to erase and then select Erase after the disk mounts. If you pick "Quick Erase" you must use Toast to burn the data for the next use.

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