well maybe some of the isos included on dvds are corrupted
or that isos lost the orginal commodore's boottblock
OK
make this:
1-choice one iso that you know that don't work on your cd32 console after burned
2-Extract all the files of that iso to any dir
3-now go to the amiga side,can be a real amiga or winuae
4-Launch the original ISOCD program by Commodore and make another iso using extracted files in step 2
5-burn that new iso using any program and back to your console and test it
please note that you need the program ISOCD by commodore and also the file cd32.tm or cdtv.tm
That files are inclued on the commodore cd32 developer kit package
also you need a bit experience making cd32 compilations
bye,Laser