If you are having this problem in Elyssa then genisoimage could be the problem.
The version shipped with Gutsy was OK so you need to downgrade and install the slightly earlier package genisoimage (9:1.1.6-1ubuntu3)
This can be achieved as follows
Download the release for Gutsy http://packages.ubuntu.com/gutsy/genisoimage
Open a terminal in the download directory and
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sudo dpkg --force-downgrade -i genisoimage_1.1.6-1ubuntu3_i386.deb
You will need to go into synaptic, highlight genisoimage and go to the Package menu and "lock the package" to prevent it being upgraded.
Thanks to bedege on the Ubuntu forums for this info, thought I would pass it on.