Hi Chuck,
this is the "well known" problem, if a MIDI file is called up by a Registration, and this MIDI file contains so called "Keyboard Voice" Meta Events.
To avoid this in the future, please make sure to have unchecked the box "KEYBOARD VOICE", when saving changes to a MIDI file in "Song Creator - Channel - Setup" screen.
An easy way to REMOVE those "Keyboard Voice" Meta Events from MIDI files is to use the PC software program "PSRUTI":
http://heikoplate.de/mambo/index.php?option=com_content&task=blogcategory&id=67&Itemid=83Download and install the program on your Windows PC and load the desired MIDI file in PSRUTI. Click "Extras ---> Delete Keyboard Events" and be sure that at least the first box ist checked (Delete Meta Events "Keyboard Voice"). Normally you can leave the standard settings (only the last box unchecked). Now click ok button twice, then Exit button and "Save" or "Save as" button. ("Save" will overwrite the original file without asking you!)
It is also possible to remove those "Keyboard Events" in Song Creator on the Tyros5, but in my opinion this is easier in PSRUTI.
Best regards,
Chris