I had an issue with my pano roof just last month. Mine would open, but the passenger side rear of the pano would not close. The safety thing E5 was refering to is incase someone or something is caught in the sunroof while its closing, its designed to stop automatically. To prevent injury or damage to the roof mechanism. My dealer took a quick look and decided the entire pano cassette (as he called it), needed replacing. Just took one day at the dealer and they upgrade it to the newer, "better" (as he put it) pano roof. Apparently, they fail often.... Not sure if this is your case, but thought i'd share my recent experience. Be sure to check if anything is lodged in your rails like rocks, branches.... things that can fly up and get caught in there. Could be something simple like that. Worse case scenario, you'll get a new sunroof, which includes the felt headliner slider that opens up when you just want to let the sun in. Good Luck!