Tommyjoe206: The window is a "Accuweld" which was special ordered (33.75x33.50). The guy at Lowe's told me I could order the glass like you said but don't you need special skills to replace the glass ? I thought that it was insulated glass the sash was put under a vacumn and special caulk was used. I guess I donot understand - if you say the seal failed and if the manufacture comes out to look at the window wouldn't he be looking for fogging between the 2 panes of glass ? Then if he see's the crack he would automatically say that it's not a seal but a stress crack ? What if I go back to Lowe's and say the seal is bad ? Thank you for helping me.:confused:

If the seal is bad you'll see a fog in the glass, what this is , is the gas inside the glass has for some reason leaked out due to a crack in the glass itself or the seal has failed, to replace it you can get a glass company to get a new glass, your sash should have removeable plastic seal you can pop out with a flat putty knife, after you replace the glass the seal will just pop back in, you can do this or just order another sash that will come with the glass already in it