I too use QB and wallet style checks. Check your printer settings again. I have printed single checks using the envelope feeder with no problems as long as I adjust the settings for it, but I usually just print a single check by pushing it to the front of the paper tray. The printer (Dell 968 all-in-one) picks it up just fine. I'm kinda lazy and don't want to have to change the settings for one check. This works for me. The worst that has ever happened using this method is that the printing wasn't quite perfectly on the lines on the check, but always legible.