This is one of my customers printer which i wouldn't normally work on but i did. Problem is not all print jobs but most when you hit print it gives message "Put custom paper in mpt bin" I've tried everything from disabling mpt tray in the print driver, setting mpt tray to letter, legal, custom, letterhead etc... Internal prints are giving this message also sometimes, not always and i can turn printer off/on and it'll print. Seems like a simple setting needs to be disabled but i can't seem to find out what???