Profile photo of tk2k

Uh yeah they even have a warning on the website, can’t say they didn’t warn you.

Allen & Heath + Mac OS X Mountain Lion
In anticipation of the launch of Apple’s latest update to the Mac OSX Operating System (10.8 ‘Mountain Lion’), please note the following:
The correct operation of the full, public release of this platform is not yet verified by our development and test departments. As a result, support for OSX Mountain Lion is not currently offered for Allen&Heath digital hardware, software applications, or third-party proprietary software used with our product ranges.
We cannot confirm a date for providing support for this platform at present, but note that full software testing and verification will commence following the official launch by Apple. As our test programmes are completed we will update this notice.
We hope this helps