Try the new xcdroast alpha 10 at www.xcdroast.org (no more 'No set-uid bit on'). Of course, run first as root, and then as user.
Some new features are: Creates Data, Audio, Mixed-Mode, Multisession. Data-DVD writing ---------------- Does it work any better? I guess you would have to update/recompile 8.1 in order to use it?
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