If CacheCDFS prefs don't list CD0, then CD0 does not use CacheCDFS. You probably copied the older CD0 from Storage/DosDriver. This one points to L:CDRomFileSystem, not to CacheCDFS. Load CD0 into a text editor and check it. If if does not point to CacheCDFS, you should reinstall the CD driver from the OS 3.9 CD (it's too difficult to recreate the CacheCDFS mountlist manually).
Bye,
Thomas
