I am getting so frustrated about the new UI that I have to start a thread about it. Everything still broken since the introduction of the new UI. Still just a group of buttons are still not working properly. ( Sliders are also not working ) Here is the problem in short: Create an area with a Horizontal group of buttons and duplicate some buttons to it. And there you are, it's broken. Take a look at the image, in explanation. Step 1) The setup is like this, 4 buttons, the first white and some other colors. The simplest as it can get. Step 2) Press Play, try to hover over the other buttons, only the first button gets the hover colors of the other buttons. Step 3) Press Stop, and delete the first button, Press Play again, and suddenly the remaining buttons work Step 4) Press Stop, and Undo !!! And suddenly all the buttons work. Except. The colors are completely incorrect. Now the correct buttons are hilighting BUT the colors should be like in the Step 1. So, All Images in hierarchies have incorrect color in currently in all version of Unity. If I save this level after Undo lots of files change in Library folder. The version controls shows the changes. Now if I save this scene and start again it will be like in the step 4, hover works but the colors are not what is set in the Image colors. When the Library folder is deleted ( like for a rebuild ) you are back to Step 1. So each time you have to wipe the Library folder you end up with a broken GUI, you have to manually delete stuff and then Undo to get it working and then its broken in other way. So you have always two version of broken GUI, either its getting your input correctly, or the colors are actually not what you set. They are always little of. But most of the time you will have white colors for all Images and you don't notice it. But when the colors are broken they have very weird offset to the colors what you actually want. I attached the scenes to produce these steps, and the scene after Undoing. ( If some Unity guy is reading, the lates bug report of this is 748342 ) PS: When the Unity can be used for releasing something ?