Experienced Pretty Serious Problem with Vision 2010 Premium

I was using Visio 2010 Premium this morning to modify a multi-page UML
Activity Diagram and something went teriibly wrong. The diagram was created
in Vision 2007. There are four pages in the diagram. Pages 2-4 are minor
variations of the same process. When I created the diagram and cut and pasted
each diagram from page 2 to it's own new page, then tweaked each diagram for
uniqueness. When I was done, I grouped everything together and filed the .vsd
away.

Today, I needed to tweak the diagram a little more. The change I needed to
make was on page 4. I ungrouped all of the elements and found that I could
not open the property window for anything at all. I used the text tool to
modeify the text in one activity. The text changed to the new text for the
same activity of each of the three pages. Since I built this using cut and
paste it appears though Visio 2010 thinks there is one element. It not seeing
all of the cut and pasted activities as separate elements. This seems to be a
serious software defect that seems to have been missed in Beta testing.