Do you have the PEC correction on? if so TURN IT OFF! I had a similar problem with my CGE Pro and I couldn't understand why the stars/mount would jump around..then I turned the PEC off and voila!..try it...even if it's not the problem, it's one less variable to deal with till you find what's wrong..

Pablo Lewin
The Maury Lewin Astronomical Observatory
Glendora CA. USA.