Just upgraded my 2018 15" Macbook Pro to Mojave. I installed the 5.0 DisplayLink driver. I have three displays, two external via a Thinkpad Universal dock. Both external displays power on and remain on, but display black. I can see the cursor. I also have a 2016 13" Macbook Pro that works fine with the same dock after upgrading to Mojave.
The DisplayLink 5.0 official release notes say this in the General limitations section:
DisplayLink screens are black with only mouse cursor visible on MacBook Pro 2018 with initial macOS 10.14.0. (28503)
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