I'm not sure what I missed but the UI seems to be vibrating for some reason. This ONLY happens when the camera is rotated. If the character (which UI Root is a child of) just moves around there isn't a problem. But if I rotate the camera around the character the UI starts to vibrate when the character starts moving around. Also it only happens when the the UI root is REALLY far away from the 0,0,0 origin. Ex: At 17920, 0, -75280 the vibrations are very noticeable. but at 10,0,0 you can't notice it.
This happens when there are no scripts (other than the default NGUI ones that are attached but the wizard and widget tool) are attached to anything.