I can also report it working with Mojave Public Beta 4 and DisplayLink Beta 5 drivers on my 2013 13" MacBook Air.
I've seen that flashing behavior when connected to the USB-C ports. I believe it depends on the cable and/or USB-C to USB adapter you are using. apparently some cables/adapters don't supply enough power to keep the monitor powered up.
I'm about to upgrade my MacBook Air to a 2018 MacBook Pro, so I expect I will be fighting that battle soon also.
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