I'm printing with a z3100 using a Mac. I'm connected to the printer using USB. I think that the computer automatically updated the print driver, it seems, as the layout of the print driver has changed. Regardless, when I print a file the printer does nothing. The display on the printer stays "Ready." The printer status window shows "printing." It shows nothing in Printer Utility "Job Queue." If I print a "Image Diagnostic Print" it prints right away, so it seems it can communicate. If I try to submit a job through the print utility it doesn't seem to recognize the file; that it, I browse and choose the file and it doesn't show it as selected in the utility (Or else the print utility crashes and closes). I also tried using the HP Print preview, and then printing, with the same symptoms. Does anyone have any advice on this one? I have restarted and even unplugged the printer for awhile (yes I was getting desperate).