C'mon, be nice windowrep. Just because that response is the first thing that comes to many of our minds doesn't mean you actually have to say it!
About all you can do is keep on the dealer and the manufacturer to provide a satisfactory solution. If they can't find a service solution, then I'd push hard for new windows from Simonton. Tolerances of frames and parts may vary during manufacture, and this may be the problem with your windows. I've seen it before.