We purchased all new windows in 2008. Several have lost there seal. One has this trance dotty cloud in it. I will be contacting them about warranty tomorrow. It states something about bringing windows with broken seals to the factory and they guarantee for 50 years.. How the heck am I suppose to do that? Leave several big holes in my house with no window??? If they make good on this warranty in an acceptable manner I will gladly change my review. There is actual mold inside at least 2 other windows. This is sad for us. We put all our savings into theses windows and also had to get a loan. Hoping they will fix the issues.