Hi there, I think this has got something to do with CUPS on the mac, I had the same problem with my HP C7283, shared between windoze and OSX, if you check the HP website and look for something called HPv9.7Inkjet_OSX10.5_Update.dmg , follow all of the instructions to the letter, including a manual uninstall of all the files mentioned in the support article, then it should do the trick.