This only applies to GT scopes with the "original" hand control. NexStar GT scopes purchased since January 2002 do NOT generally have the "original" GT hand control.
The original GT hand control (the "GoTo" control for the NexStar 60/80/114/4) has several documented flaws, chief among them:
Celestron released an updated hand control with all telescopes manufactured after December 2001. All of the above issues have been corrected. Read my review of the new GT hand control here. In February 2005, Celestron announced a user-upgradeable hand control that is compatible with the GT and Tasco scopes - this hand control will be available for purchase through Celestron dealers late in 2005 - read this for more information.
To determine if you have the original model power up the scope, press Enter, then press the 6 button on the number pad repeatedly - if it cycles through Auto Align, Two Star Align and Quick Align it is the December 2001 model. If it also includes SkyAlign, it is the 2005 model. If it only displays Auto Align, it is the old model.