Solved! Go to Solution.
Solved by Curtis_Waguespack. Go to Solution.
Just updating this old thread with a link to the same issue and a solution, in case someone else happens across it in the future:
http://forums.autodesk.com/t5/Autodesk-Inventor/Move-Multiple-Parts-in-Assembly/m-p/3824019#M466280
I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com