When I click to zoom in on the photo when in the IPTC display for that image, if I then press ESC while still zoomed, the dialog is dismissed as expected but the zoomed image remains. I have to then quit PM to get rid of the disembodied floating image. If I invoke Exposé it is still treated as any other modal window - i.e. it disappears if viewing all windows or application windows, but moves aside when viewing the desktop. This is in 4.5.2 and the 4.5.3 Beta, under OS X 10.4.11 and is repeatable.