Sprite clipping on mac but not PC.

[AnthonyPower]

I have a weird problem with the UI2DSprite class and unity sprites. When I am on my Mac a sprite that is 512X512 is cut down to have just a bit of padding when I add it to a UI2DSprite and it goes to 214X512. Yet when I am on PC the same sprite in the same scene is 512X512. This is frustrating because when i switch machines my sprites get stretched and look wrong.
Is this a function of NGUI or some setting i missed in Unity's import settings?

[ArenMook]

Anything related to 2D sprite system is on Unity's side. NGUI simply draws it using UI2DSprite with the values Unity provides.

I don't advise using the UI2DSprite until Unity 4.5. Quite a lot of functionality is simply missing at this point.