For me this is also NOT solved. I checked the appropriate boxes in the security settings but the third screen stays black. It is shown in System Preferences -> Monitors, but thats all, nothing is visible on the screen.
I have tried installing the older driver again, uninstalling and installing 5.2.1, nothing seems to helps.
MacBook Air (Beginning of 2015, 2.2GHz i7)
Now, again, after the desaster with MacOS 10.13, I am left with a missing screen in my working environment...
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