I have numerous printers at the same account that are displaying the add paper message when paper is present in the cassette. Has anyone seen this problem?

This should be posted under the In The Shop -BW for a quicker response. Did you check to make sure there is nothing behind the cassettes and the paper is indeed hitting the paper detection sensor.

Delete and repost in the service section. make sure the printer, driver and word processor are set the same size. word perfect and open office will screw this up sometimes