JR, I created a custom lower 3rd in PA 2.0. The lower 3rd's Veg project properties are 1920x1080 and PAR is 1.0. I then created a project with the same properties. When I insert the lower 3rd it comes in with PAR 1.333. I've tried it with and without "Match Pixel Aspect" checked - same results. Let me know if you are unable to duplicate this and i'll send you a veg.
/jerry
/jerry