I have been going crazy trying to get this to work so now, I am asking for help; I hope someone here has had this problem and solved it. HP says that the 6MP is compatible with Mountain Lion, Apple says the 6MP is compatible with Mountain Lion -BUT- I can not print anything correctly and when it does print, it prints as if it was printing a photo of the page and generally cuts off the right edge. This, even though the margin settings are correct for 8 1/2 by 11 paper. I didn't just rely on software update, I went to HP and got the driver install image and this went off without a hitch. It works from windows 7 with no problems so far (still testing, looking for a clue as to what could be the problem because it does not make sense that I can do anything with windows that I cannot with a Mac) but I would much rather print from Mountain Lion rather than reboot my mac pro -it will not print from a VMWare Fusion virtual machine. I have the parallel to USB cable from Prolific (the name on the cable is something else but those are the people who made it) and I can see the printer (it even shows the correct picture) but no printing ever happens. I have the correct kext installed. I tried making my MBP (for convenience) a windows server and then printing through sharing and, in the sense that everything went well in the setup, it worked. Then, I tried to print and the printer was essentially permanently paused; I would click on resume and it would instantly go back to paused. Tried printing from MBP + Windows directly, no problem, the printer works fine. I am considering a solution that was suggested elsewhere involving a wireless connection through a wireless router which, if successful, would allow me to print from anywhere -including from my iPhone! but I am concerned that if the problem is in the OS (and I have seen nothing to suggest otherwise) this would be a waste of money and time. I have come to consider using a Raspberry pi as a printer server but I fail to see how one form of CUPS could print to it when another can't I am out of ideas. I love this printer and worst comes to worst, I will reboot. At less than a cent per page and for someone who's needs are essentially B/W and High Res with high readability, there is no need to change and I do not think they make printers like this anymore. Thus, barring things like "get a new printer" any ideas are welcomed.