I have run into several wireless printing issues with Mountain Lion the past few weeks. Last week I was at a clients house who had an Epson Workforce Wireless printer that was working fine with 4 other Mac's and 1 PC in the house but a new Macbook Pro with Mountain Lion would not even see the wireless printer. After downloading and installing all kinds of updates for both the Macbook and the printer, I finally gave up and simply shared the printer on one of their imac's and connected to it that way. Today I ran into the problem again at another clients where a new Macbook Pro with Mountain Lion would not see a wireless HP Photosmart D110, I updated the printer firmware and tried to install the printer with downloaded Hp software and from the Mac directly and in both cases the printer could not be found. The printer showed up once and installed but would not print. Then it would not show up again. Other computers in the house had no problem finding the printer.
Does anyone have any clue what is going on here?