i'm on virgin moble with lg optimus v rooted phone. one of rooting's perks is to put apps on your sd card that otherwise aren't allowed. after doing so, (as i have many times before) all my apps on sd were marked not installed. and icons replaced with the green droid standard icon(this all happened while i was using an app and didn't pay much attention when my phone froze bc freezing happend regularly for me). it was later i realized sd apps missing and i googled and ended on this thread. didn't find my answer, but i went to the apps manager screen in settings. all the apps were greyed out except for one of the apps that wasn't meant for sd card installation. it had it's regular icon and said "computing.." which to me meant this app was somehow responsible. i "move to phone" this app, and all my other apps came back lickety split. hope this helps in some way.