It seems to me that the culprit lies in the generic name of the object <rectangle>, not necessarily in the Edge animation.
I had an issue with a simple button object that went away after renaming <rectangle> (the contents of the button was a simple rectangle filled with a RGB color) to something else.
The issue leads to a none working button in the Desktop Content Viewer to preview the folio or the article.
InDesign CS5.5 v7.5.2 with OS X 10.6.8
Adobe DPS version:
folio format version