Don't know if MW stands for Marvin but probably are. I too was sick to see all the postings on rotting windows because mine are headed in that same direction. I called the company and now have a Claim#. Someone was going to come out to "repair" them this Thursday but I had to cancel because I have a commitment. They are going to call to set up an inspection. I am not holding out too much hope after what I have read on this site.