Steve,
Understanding that Dale is correct, if I were you I would upgrade to the latest version of Microstudio and use it to load the songs off of the disc (the bad cdg) that didn't load into Hoster as .kma files, as bin files.
(see post my post:
http://forum.mtu.com/showthread.php?p=64768#post64768 )
MTU have made major improvments to the importing code.
I have not run across this problem so I have never done this in Microstudio but I feel certain you can load the .kma files and the .bin files into the "Write Disc Menu" of Microstudio and burn them as one disc. If for some reason this does not work you can use songverter to connvert the .bin files to .kma files (or visa versa) and then burn your disc with all .kma (or .bin) files. The main thing is to get the songs off of the bad cdg that did not load into Hoster as .kma files loaded into the computer in a format that you can work with.
I Hope This Helps
Jim