CD is not bootable

[srcfoo]

This is my second revision of my custom boot CD. The first version I made I had only removed some packages to slim down the CD size, but that was it. It worked fine.

I've created a second version now that has several customizations to the KNOPPIX image on the CD. I have also added a Fedora folder to the base of the CD that contains some install images. I also added a fc4 folder in boot/isolinux that contains the fedora boot images from the Fedora Core 4 CD. I have customized the boot menu which involved removing all images that were being loaded so it's simply a text menu with my custom menu options. Nothing fancy.

I'm using this command from the remastering knoppix howto:

mkisofs -pad -l -r -J -v -V "KNOPPIX" -no-emul-boot -boot-load-size 4 \
-boot-info-table -b boot/isolinux/isolinux.bin -c boot/isolinux/boot.cat \
-hide-rr-moved -o /mnt/hda1/knx/knoppix.iso /mnt/hda1/knx/master

The iso is bootable under VMWare and the CD boots on a couple of machines. The other ISOs I have boot on all machines including my first remastered ISO.

I can't think of anything that I'm doing wrong and I thought that if it wasn't going to work it wouldn't work with VMWare. Guess I was wrong.

Any ideas?

UPDATE:
More specifically the machines I boot from act like the CD in the drive is not bootable. I've tried arguing with the CD drive, but I just can't win. :?

[srcfoo]

I created a bootable floppy using Smart BootManager. If I boot to the floppy and select to boot to the CD-ROM, everythings works great. This definitely seams like either a problem with the version of isolinux, mkisofs, or Easy CD Creator which is what I'm using to create the CDs.

My bet is on mkisofs or that the isolinux.bin and isolinux.cat files were somehow corrupted. It makes more sense that it was the prior since I've copied fresh copies of each file to my master directory from the Knoppix 4.0.2 CD.

Anyone?