here is one possible fix:
commit b2068cd6914c9b766756b6921e9ae59bfd9e4429
Author: Jesse Hathaway <jesse at mbuki-mvuki.org>
Date: Wed Oct 31 16:20:57 2007 -0400
fix isolinux when booting multiple kernel flavours
pull from:
git://lifesaver.mbuki-mvuki.org/~lollipop/live-helper.git miscfixes
-Jesse