Full screen stretching

this is not specifically a unity 5 problem, but as this is what I am using I thought it best post here.

Ok. Here is my problem. I have a game that scales to any resolution. Running it on any device and screen resolution (iOS and android) works perfectly. As soon as I build for full screen OS X the graphics are stretched horizontally. If I run in a window of any size, everything is perfect.

How on earth do I get full screen to work by making use of the resolution in the same way a mobile...

Full screen stretching