Display LinkアダプタがmacOS 10.13.4では動作しなくなりました。
Important Information about macOS 10.13.4 update
http://www.displaylink.com/downloads/macos
We
have become 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 have 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 or earlier at this time.
同様に、duet displayも動かくなっているようです。
*We recommend staying on macOS 10.13.3*
https://help.duetdisplay.com/faq/305404-macos-10-13-4-support
Installing macOS release Version 10.13.4 will cause Duet Display stop
functioning after the OS upgrade. 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.
We would strongly recommend contacting Apple though their bug reporting (https://developer.apple.com/bug-reporting/). It will help have the bug prioritized if Apple is aware how many people are affected by this issue.
We
are actively looking into workarounds so that duet is not affected by
the macOS bug, and will keep you informed. Please e-mail us if you have
any questions. Thank you for using duet.
この状況だと、macOS側の問題のように思えます。問題が見つかったのは4月の始めでまだ解決されていません。
