EricT
My feedback
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216 votes
AdminWim
(Product Manager, DisplayLink)
responded
We are aware that installing macOS release Version 10.13.4 will cause DisplayLink connected displays to go blank after the OS upgrade, with the current DisplayLink driver [4.1] installed. Functionality such as Ethernet and audio, where implemented, is unaffected. We have alerted Apple to this issue and are working hard to find a resolution. These features continue to work as expected in 10.13.3.
In the meantime, we are releasing a new driver [4.3] that will enable clone mode, but not mirror or extended mode displays in 10.13.4. If you require mirror or extended mode displays, we recommend that you stay on macOS 10.13.3 at this time.
We understand that this loss of functionality on OS upgrade is potentially disruptive for our users and customers. Please be assured that this issue has the highest business priority in DisplayLink. We thank you for your patience and will provide an update on this situation,…
EricT
supported this idea
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EricT
commented
On 10.13.4, this breaks for me. I had intermittent issues with 10.13.3, but now it just won't work at all. (Also tried re-installing drivers.)

The plist under /Library/LaunchAgents/com.displaylink.useragent.plist have a key value pair of Program: /Library/PrivilegedHelperTools/DisplayLink/DisplayLinkUserAgent.bundle/Contents/MacOS/DisplayLinkUserAgent
But the DisplayLinkUserAgent.bundle is not there so its failing (throwing a status code of 78 if you do a launchctl list.) I'm not sure if this has anything to do with 10.13.4 or not but I figured it was at least a start.