I bought duet display so I could use my ipad as another monitor. if I try and make the ipad the main display and the mac display the secondary the program freaks out. it immediately defaults back to extended and then there is massive glitches and flickering to the point where I have to restart both apps. I really wish they had documented the fact that the ipad cant be the main screen with the dock otherwise I wouldn't have bought it. Unless someone knows a workaround?