So I’ve just run into a very strange problem with Unity that has never happened to me before; I was working on my project and everything was fine, until I ran it to check if something is working. After exiting the play mode, Unity started act weird. What happened was I could no longer drag for example my prefabs from the prefabs folder, or I could no longer move objects around in the hierarchy window. In play mode same happens. When I select an asset in my Unity folder it stays selected, even when I try to deselect it.
I’ve already tried:
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Restarting Unity.
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Closing VStudio, and any programs that could affect Unity. (VStudio, GitHub, Photoshop)
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Rebooting PC.
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Restarting Explorer.
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Running Unity as Administrator (even though its set to that by default)
Currently running: Unity 5.5.0f3.
Running on: Windows 10 (latest update)
Never previously had any trouble with Unity.
EDIT: I do not know how this work, which I find bizarre, but restarting my PC 3 times did it. Not sure what the difference was, but the third time fixed it. I will leave it here, in case anyone ever runs into the same problem.