Hi Dave, there are some issues with MoI on the new Retina Mac - Apple has introduced a new mechanism there where it basically lies to some apps and tells them that their window is only half as big as it really is so and then displays it as doubled up in size in order to avoid making things like controls too small on the screen.

Right now they did not seem to include any method to turn that mode on or off for every kind of app, so you will probably end up with MoI looking kind of weird and blocky since it will force it to use that "half size and then stretched up" display method.

You can avoid that if you set the screen to the real full resolution, and you need to use a separate utility to do that since Apple decided to not include that in the regular display settings, see this thread for some info:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5211.1

So anyway that will be one issue that you will see on that one particular Mac model right now.

- Michael