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 had this problem, just open unity and turn off your network, choose to work offline.Open your project and then when the project opens, turn on...
have found a way to remove the black screen when switching between scenes in this link: [MEDIA]
I have found a way to remove the black screen when switching between scenes in this link: [MEDIA]