A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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I'm having the exact same issue. However, every time I delete the 8.4 files they seem to pop right back... I wound up going to Assets>Google Play...
I had the exact same issue. Switched from Unity4 to Unity5 on a project, and GL.Color was not taking, and instead defaulting to white. I moved...