Displaylink ceases to work in 10.13.4

[chadeeven]

I'm running 10.13.4 on my MacBook Air. The 4.3 beta 3 worked when it first came out for me. But I installed the beta 4 last week and all I get on my usb monitor is the same blank screen that I got when I upgraded to 10.13.4. I tried uninstalling beta 4 and reinstalling beta 3 and it still doesn't work. I tried installing beta 5 that just came out and no change. I followed the instructions that were posted. The DisplayLink doesn't even show up in my airplay. I've granted permissions for DisplayLinkUserAgent in Accessibility.

I think the first way to solve my problem is understanding why DisplayLink isn't showing up in my Airplay. Can anyone help?