I'm not sure when this started, but I have found that "snapping" windows to the edges of my screens is not working properly. It seems to be aligning the *contents* of the window with the edge, ignoring the width of the window border. This is most noticeable when I try to align a window at an "edge" between two screens; the window border "bleeds" over onto the other screen.
Anyone else seeing this? (Fully updated Fedora 19, BTW.)