What do you mean by messed up, can you share a screenshot. What scaling mode did you use?
I actually still use 480x320 screen size as stencyl recommends and then use scale to fit full screen. For pixel are i import my assets at 1x and for vector are I import at 4x. All my games scale fine on all devices.
Thanks for your reply. I'm using Scale to Fit (Full Screen). The issue I'm having is that the background is repeating rather than filling up the whole screen, so I was thinking I had to create a larger graphic.
Here's a gallery of screenshots of the problems:
http://imgur.com/a/yTxdVAll IPad photos, the first you can see the bottom of the background is repeated vertically and the second picture is when I turned off repeat background. (don't mind the tiles and actors I need to adjust their placement)
The 3rd pic the tiles are supposed to be on the bottom of the screen, so I'm thinking I'll have to adjust the scene size?