you mounted the cd rom to the root directory? :S
if i had to guess id say maybe it has to do with a link to the default cdrom device file on your system. check the /mnt folder for a cdrom folder maybe, or cd or whatever. if it exists, then create a symbolic link so that wherever you mount your cddrive points to the default /mnt/cdrom folder, or whatever it is. ie:
ln -s /cddrive /mnt/cdrom
this is just my guess and can be totally wrong, but wouldnt hurt anything if you tested it.