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Problem

You restored a Gateway Backup with the Disabled option

Your Realtime Tag Provider Default is not Enabled

Your Project(s) will show

and if you Edit a Project you'll see

Solution

Enable the Default Tag Provider. 
Even though the MES Tag Provider is an actual Node, we do not recommend deviating from configuring your Project with "Default"

https://docs.inductiveautomation.com/display/DOC80/Tag+Providers

OEE 2.0 Framework

Live Analysis