I have found this thread through the magic of google! I have a bedroom with two large south facing GGL410 windows. I originally installed blackout blinds on both windows around 2000. So far, I have had three (pr possibly four) failures due to this problem. The most recent were in June 2008 and a few days ago. It is obvious that plastic is an unsuitable material for the cord guides and that they should be made of metal or at least have metal inserts. I was googling to see if they had been redesigned yet before purchasing yet another blind. I'm happy for you to use this information to complain to Velux.