I think this happened after installing Adobe Digital Editions. When I open Adobe Reader and then open a pdf, everything works fine. When I double click a pdf file, I lose the close box and menu and have to exit the program using taskmanager (ctrl-alt-del). I've made sure that the "open with" selects Adobe Reader. I've tried every preference I can think of, and it is 100% reproducible every time (with any pdf document - image or text). Any thoughts? Thanks.