Some important news from MOTU!
http://www.motu.com/video-newsitems/motu-video-interfaces-mountain-lion-and...
Mac OS X 10.8 (Mountain Lion) is now shipping, and MOTU has worked with Apple to ensure that MOTU video interfaces are compatible with Mountain Lion, and to provide a smooth transition for your MOTU video I/O when you upgrade to Mountain Lion.
Gatekeeper
The MOTU universal video installer for Mac OS X available at motu.com/video-download/mac-downloads is properly signed for Mac OS X 10.8's GateKeeper feature, so you can leave GateKeeper enabled when installing the latest MOTU video hardware drivers.
GateKeeper only affects installers that have been downloaded from the internet, so you can freely use any installers from your original MOTU product installer CD.
Final Cut Pro X support
The V4HD, HDX-SDI and HD Express now support Final Cut Pro X version 10.0.3 or later. This means you can monitor Final Cut Pro X output on video monitors connected to your MOTU video interface. Simply download and run the latest MOTU video installer and you are ready to go.
Dave Roberts - MOTU