Don't have a CDZ system I'm afraid but most CD issues are down to media or burning speed / software. I've played it on my NeoGeo CD from disc and it works fine.
Some of the later Neo Geo CD games used copy protection. The front and top loaders didn't use it... but the CDZ did! Some of the later games have been patched to work on the CDZ. I don't know if you're using images of games to build these, if you use a later game it might be the cause?!?
I'll see if I can get my toploader to work (broken lid) to double check.
Thanks for all the effort..especially for Shinobi..!
Eswat and Alien Syndrome next...?
193 days ago(+1)
Same disc works on the toploader!
Definitely copy write protected on the CDZ.
If you need me to test anything out on the CDZ in the future just let me know!