An angry developer
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An angry developer
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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,…
An angry developer
commented
This renders machines potentially insecure while we wait for an alpha build? Ya had a year to get the beta right. Sorry excuse for a hardware company, even sorrier on the software end. Worst cost cut ever was choosing your junk over real products with talented devs.

It’s also easy to open the Ethernet ports right up, even without escalated privileges. Ask them about that one too ; )