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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My VS 2015 was working fine and all of the sudden it gave this issue (where it stopped the intellisense). What worked for me was to simply close...
Seems like this might have great potential.... will give it a shot too... will give feedback if I do happen to get to it. TY very much.