Hi, I have ported my 3D game built only with GUI ( IN CUBE ACTION ) to the new 5.2 version and you can see the results here http://forum.unity3d.com/threads/3d-game-built-entirely-with-the-new-unity-gui.352046/#post-2299282 Big improvements in draw calls! Bugs: Some UI elements were just missing ( text, images ), some sliders showed strange behavior ( did not showed the sliding line all the way, if the slider was from 0-1, then if the value was <.3 slider line just vanished ), some buttons were flicking wrong when mouse was getting in or out of them. Every problematic UI element was world canvas, it had some position in 3D. Every single problem was solved with the same fix. I had to change ONE of the rect transform rotation, from 0 to any other value. 0.000001 was also solving the problem.