Hi Brent,
display.screenOriginY gives me a negative value. Lets assume display.screenOriginY has the value of -80 then my math is:
1200-(-80) = 1280
Thats the same as your math:
1200+math.abs(-80) = 1280
I think my math is correct. I have the same math for Android and there everything is fine.
Perhaps this http://forums.coronalabs.com/topic/53236-admob-v2-using-sdk-version-680 is the reason for the wrong values on iOS?
Best regards,
Thomas