I just started using Unity 4 version 4.5.5f1 and I’m doing the Roll-A-Ball tutorial. Just about every time I make changes to go along with the tutorial and I hit the play button those changes are lost and I have to repeat those steps over and over to make any progress. What is going on? Why are my changes being lost? I keep saving the scene and the project but that doesn’t seem to help.
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Changes made during Play, including when Paused, are not saved(this is a feature of Unity that allows experimentation without causing permanent damage).
You should always Stop the game completely then make your changes if you want your changes to be permanent. There are a couple of work arounds for this like copying an object when in play, then pasting the copy back in once stopped. But on the whole you should press Stop first. 