I can print from Notepad, Adobe Reader, Execl 2007, Outlook 2007, just fine. When I try to print anything, including a new, blank document with the word test, I get an alarm on the printer and the error "Supply Rec. Paper" on the LCD screen.
I Googled it and was getting answers about things like feed tires, sensors, etc. However, if the other programs print fine, it seems more like a device setting or driver issue to me. I un-installed, downloaded and re-installed the latest drivers from Canon's web site.
BTW, this is on an XP Pro machine.