It looks like people are having some issues with the new DLC for
Crackdown and these are the losing all your progress kind of issues vs. a basic glitch. The problem seems to stem from joining a co-op game with a friend and then playing solo. There is a way to avoid this problem which is documented
here. I followed the directions just to be sure, no way I want to have to hunt down all those orbs again.
Thanks to
Dtroid for the scoop.