I used to have a problem where AMEP would crash if I tried to pan while using the 3D Orbit command. However, they seemed to have fixed it with one of their service packs (or, at least it doesn't happen anymore).
If you haven't already downloaded the last service pack(s) (product updates) from http://usa.autodesk.com/adsk/servlet/ps/dl/index?siteID=123112&id=2334435&linkID=9240938#section1, I'd recommend doing so and seeing if that helps.
If you've already got them, then hopefully someone else can help you out!
-Brad