Do you have any problem with AcMapRightClickMenu.arx? I understand that there is a improvement about this in AutoCAD Map 3D 2010 Update 2, please refer to http://usa.autodesk.com/adsk/servlet/ps/dl/item?si
Here is the snippet in readme :
Changes Included in this Update
· AutoCAD Map 3D sometimes crashes in module AcMapRightClickMenu.arx during start up.