No glitch...sounds like you are trying to edit a factory style.
You must record(play in) your own style parts before you can edit them.
Only part of a factory style that can be edited is the drums.
Ian
------------------
Remember to leave good news alone.
_________________________
Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.