The moonroof slides back and forth just fine and will fully open. Unfortunately when I try to close it, it doesn't fully close and stays in the vent open position. I have cleaned the rails and lubed them. Does anyone have any ideas how to fix this problem?

Here are a couple of pics that show how it's stuck:

 

Just in case you need to close it manually... there is a small cover on the headliner behind the dome light. You can remove that, stick a wrench in there and close it or open by hand. Hope that helps.