App zoomed in/cropped

[mon]

Hi

Not sure whether this should be in iOS or beginners, but here I am!

Developing an app with a stack size of 640 x 960 (which I think is the correct size for my test device: an iPhone 4s).
In the simulator it's showing blown up so I can only see the top left quarter. Same when I build and test on the iPhone.

Equivalent app works fine on an Android device (Nexus 4).

Any ideas?

(Running 6.1.2-rc-1)

[mon]

Well, I don't know about Mayya (!?!) but I'm no nearer to a solution.

I'm thinking there's a setting that I've missed that's causing the stack dimensions to double somehow between being in LiveCode (where it looks to be the correct size) and the simulator/device (where it doesn't).

Any ideas of what to check? Any thoughts gratefully received