I have a macbook air (lion) and a mac desktop (snow leopard), which both printed wirelessly from my HP officejet 6500 wireless. After about 6 months of wireless printing, I could no longer print wirelessly. I now have to connect printer to computers using usb. I have tried re-installing numerous times. HP even tried to fix the "problem" to no avail. I am wondering if upgrading to mountain lion would fix this issue. Has anyone heard of this problem?