<strong>Yahoo Message Number: 5663</strong>Thanks for the comments and information, folks. I forgot to say that we live in our 40' 1997 Affinity, #5448. Three of you have replied that you have the same problem .<br/><br/>Fred, "creaping" may be a more descriptive word for what the black seal material is doing between the panes. On four of our windows, the seal material is displacing (or bulging)...