I've had yet another thought on your problem. Have you tried uninstalling and re-installing the software? If I remember correctly, I inserted the actual SD-Jukebox V2.4 and then loaded a floppy named "SD-Jukebox" VERSION-UP Disk. I think this update was needed because Jukebox was found to have a problem. However, not having used it much, I cannot confirm whether it has or not, but if you haven't updated it, this could be the cause.
Hope this helps.