Out of the blue, I can't move Safari windows to new or existing Desktops in Mission Control. When I attempt, they just spring back to the first original Desktop. So right now, I have a ton of Safari windows in Desktop 1. I tried iChat and another app and that moved fine and it stayed there in Desktop 2. Everything is up to date. I've not changed anything for this to go haywire. I have rebooted the system. Any ideas? Thanks!