Important Information about macOS 10.13.4 update 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.
I am VERY interested in what DisplayLink is going to do. I have seen multiple articles claiming 10.13.4 permanently disables extended monitors using the DisplayLink driver. DisplayLink made a statement about working on it back in Feb and then an update first week of May saying mirroring will work but that is all and people should just use 10.13.3... I have 1200 users with Dell D600 Docks. My confidence is NOT high... Anyone have an alternative that supports Thunderbolt 3, 2 external displays and has gigabit ethernet for less than $300? Anyone have any more information from DisplayLink?
We got hit hard by this (of course 10.13.4 deploys the day I go on vacation), and I don't think there are any great solutions out there. The best workaround has been simply cabling the monitors without DisplayLink, which means MacBook Air users wanting multiple external displays are out of luck. I've tried, and failed, to get MST to work even on "supported" machines and monitors. The Matrox DualHead devices may placate a few users wanting to run multiple monitors off one port, but they're limited and pricey.
@Andrew.Rogers Due to the lack of "nice" solutions and as we had the need to quickly deploy the TB3-books in late 2016, we settled with this docking station:
It has Gigabit Ethernet, USB 3, it charges the Macbook Pros (60W, which is also enough for real life use of our 15" devices), and is enabled to support two external displays. The only drawback is that you can connect only one display directly via e.g. an HDMI or DP cable and the second display needs to be connected through, e.g. an USB C to DisplayPort / HDMI cable.
It is a solution that has served us pretty well during the last 1.5 years and is also below 300$ even with the additional adapter cable :)
@AndreasRumpl The Lenovo dock was one we looked at. After a couple weeks of testing we have settled on the Kensington SD5200 Thunderbolt 3 dock and so far we are very happy. It does everything we need it to do for the Macs and as a bonus, it will handle power delivery for PCs as well so it can do double duty in a pinch. It is globally available and our unit cost after some haggling was less than $250. Bye DisplayLink...