Animations are resetting when move/changing an object in PPT2007

Hi everybody,

maybe somebody can help me out there.

We have an PowerPoint Addin using non MS-Graph or 2007 Graph slides for
displaying bars.
we using a rectangle with the size of the bars. During a presentation i
collecting data from my hardware and just try to resize the shape in the
size for displaying it. now it always happens that the presentation is going
to the point where i stop collecting and updating the bars. When i try to
update the "bar - shapes", in 2007 it is resetting the animations to the
index (0) Animation of the actual slide. I can force the program to go to a
specific location, but this is not the best way. Why does 2007 do these
things?

Best regards,

Martin