I am using Blender 2.68. thanks for asking Gaia.
However, I went ahead a got another dae to test, and tested one of my own. Those have vert groups. So, seems the other files are just odd. Sorry I should have done more testing before calling out. My guess is the other files are made very different since they move as expected when uploaded to aditi, but when inspected in blender they do not have vert groups.
thanks