I'm hoping someone can help us. Our upvc window frame is lifting up off th windowsill. Does anyone know why this might be happening? We've just sold our house and are trying to get everything in order before we move. I've attached a photo of the problem. Any help is much appreciated. Thank you. [GALLERY=media, 99525]IMG_1321 by Elsbeth posted 9 Apr 2017 at 8:29 AM[/GALLERY]