I just moved from a PreSonus AudioBox USB to an 1818VSL on my iMac. When I load the Aria player and try to change the default sound source to the 1818, I just get the spinning beachball and I eventually have to force quit. I've tried the 1.2 drivers and the 1.2.2 Public Beta Drivers and they both do the same thing.
I don't understand what the Aria player has to do with your USB audio interface. Aria belongs on a plug-in track.
--Well, ARIA also can be run in stand alone mode, independent of a plugin rack in a host program. It sounds to me like jhale1966 tried to play it from his desk top, in stand alone mode - is that right, jhale?