AutoCAD 2013 :: Mesh Modeling Not Functioning Properly

view the screen capture video here: [URL]

Basically, I create a simple mesh primitive box.  I set the selection filter to vertex, and select all vertices on one side of the box.  If the selection of all vertices actually registers, it simply moves the entire object, not just the vertices selected.  I've tried this in all directions, and the same thing happens..  Other times, it chooses to only move one of the vertices, a result I cannot reliably reproduce -- it just sort of "happens".    Scale and Rotate all function normally.

This is happening for me in Civil 3D 2011 as well as Civil 3D 2013.  I launched "Civil 3d 2013 as Autocad", and this problem doesn't seem to happen.  Also, in "Civil 3d 2013 as Autocad", the vertex nodes all select as red, not as blue as seen in the screencast link.  I spend all my time in Civil 3D, and would like to find out why this is happening so I don't have to constantly switch platforms.

This has also been posted over in the Civil 3D group, but since it's a regular "Autocad" entity, I was hoping to have more luck here.

I'm running Win7 Pro, 16GB ram, 2.67 Ghz 8 core processor and latest service packs on everything.