I'm on mac as well , I can only guess what they might do, but would experiment instead... I'll PM you a plugin that helps set the screen to A series... then select Full Scale 1:1 and Match Screen Display try it on a simple model, first... john

If you match your viewport ration in V-Ray, then what you see in SU will always be what comes out of V-Ray. If you want to customize the ratio, for example, you what a true 16:9 proportion, then you can use ThomThoms V-Ray Toys plugin. http://sketchucation.com/forums/viewtopic.php?t=15491