I have fought ever since I bought my printer to print half-sheets (8 1/2 by 5 1/2 inches) in Tray 2. Sometimes it works, sometimes it doesn't. I can't remember exactly at this point-since I last tried this two days ago-- but it seems I get an error message that says load paper in Tray 1, which is a manual feed tray. I have the half-sheet paper in Tray 2. I have set the physical guides to that paper size, and I have set the paper size (half sheet) and quality in the printer settings and in my document settings. What am I doing wrong?