AutoCAD Inventor :: Shifting Location Of Template Border And Title Block

We want to use our AutoCAD company standard templates within Inventor. I’ve followed the procedures to accomplish this under the heading:

Create a .dwg template in Autodesk Inventor from an AutoCAD .dwg template

This works without any problems.  Inventor is able to recognize the size of our template border (20.75” x 33”) and correctly selects a sheet format of 24” x 36”.  The template border is centered on the 24” x 36” sheet just as we would like it (see attached).

The template is used to create a new Inventor .dwg, and base views are placed and annotated.  No problems, everything looks good.  The new drawing is saved and Vaulted.  However, at some point Inventor "shifts" the location of the template on the 24” x 36” sheet format (see attached).  This action is unpredictable.  The drawing might be checked-out and checked-in several times before the “shift” happens.  When it does we have to re-locate the views and other text annotation to suit the new title block & border location.

How can we lock the position of the template border & title block?  (Should be noted that we need to keep our template positioned such that the bottom left corner is at 0,0,0 when it is opened in AutoCAD.)

Inventor RS 2011
AutoCAD Mechanical 2011
ASD 2013
Vault Collaboration 2011
Windows 7 Pro