MacBook Pro (Lion OsX)/Cubase 6/ Yamaha n12

I have a MacBook Pro with the Lion OsX operating system. I have Cubase 6 and have a Yamaha n12.
Despite various efforts, updating the software from Yamaha website, removing and re-installing them several times, I’m unable to get the Cubase system to recognise the n12. They will not speak to each other. Looking on the web and some forums it may be that the Yamaha updates to not cover Macs with Lion OsX operating system. Can anyone confirm this? If so, do we know if there is an update pending? Or am I likely doing something obviously wrong? Many Thanks…Graham