I have installed an HP OfficeJet L7780 as a network device. From the 2 computers (both running Vista Business) send documents to the printer, very often the last line is missing or only printing the top half of the line. This can occur even if the document only takes up half the page, so it isn't a margin issue. It happens intermittently and sometimes reprinting the page fixes the problem, but not always. I have removed and reinstalled the software, to no avail. Searched the HP website but of course there are no problems like this listed although I can't believe I am the only user with a problem like this.