UC Surface is supported on Mac OS X 10.8 or higher. If you try to run it on an older OS such as 10.7 or 10.6, the controls will appear reversed.
The demo on the other hand will run correctly on 10.7 or 10.6, however it might work on the demo, the minimum system specifications for the RM mixers remains with 10.8. As 10.8 and newer Mac OS are free upgrades from previous OS X releases, upgrading your OS will get you up and running quickly. We apologize for any confusion that this may have caused.
To read the full technical specifications for the RM Mixers you may do so here: http://www.presonus.com/products/UC-Surface/techspecs