I have been having the same trouble with X7. Im using windows 8.1 and an HP design jet 500. I was using X6 and it all worked good. Now with X7 it tells me that the printer is set to 0 DPI and wont print. The printer box that pops up shows the DPI at 0 but its greyed out so I cant change it. I went to HP website to check for newer driver and they no longer support my printer. I just tried printing to PDF and then printing it and that works but the scale is off a bit.
Any ideas? Is there a trusted web site for drivers other than HP?