I have this working after toggling my firewall off then back on again.

anyone having issues with the 2nd display getting stuck in mirrrored mode?
Mine went to sleep and when it woke up both displays are mirrored.
I tried to turn off airplay, unplug, ect, but everytime it comes back it shows up as a mirrored monitor, even though the system THINKS there is a second monitor (mouse travels past edge of screen).

I'm getting the same thing. I can't get the DisplayLink screen to work in extended mode. Even when AirPlay says it's being extended, it only displays what is on the primary screen.

It'd be really nice if they would just fix the issue already, the workaround makes a 2nd monitor usable, but for crying out loud, fix the issue!!!

I just checked again. Putting the Mac to sleep without deattaching the screens and then waking it up causes no problems. It seems to be a combination of sleeping and deattaching which causes the need to reinstall for me.

Dear DisplayLink macOS users,

Installing macOS 10.13.4 will cause DisplayLink connected displays to go blank after the OS update when using DisplayLink driver v4.1. Extended displays continue to work as expected in macOS 10.13.3, and we can only recommend that you stay on macOS 10.13.3 or earlier if you require this feature and have not already updated. Functionality such as Ethernet and audio, where implemented, is unaffected.

We have now released DisplayLink driver v4.3 beta 4 providing an interim solution with one extended USB display (720p or 1080p) on macOS 10.13.4, using Apple AirPlay®. All additional DisplayLink screens will be cloning the primary display. This updated beta removes two main restrictions from last week's v4.3 beta 3: Wi-Fi no longer needs to be enabled, and the driver is allowed access through the system firewall. When starting the machine, AirPlay requires you to re-plug the device after login.

Please see the updated FAQ for details on how to enable the DisplayLink AirPlay display for extend or mirror mode.

Our team has made some solid progress towards finding a solution which would restore full extended display support for multiple DisplayLink displays in a future release of macOS, but we are unable to provide a time-frame or a date for release of this solution at this time. We will provide an update on this thread as soon as we are able.

Thank you for your continued patience and we appreciate your feedback and support.

Kind regards,
Alban

Still no picture
 

I done everything you said. I got it running and there still no picture. I can’t even duplicate the screen. All I see is a black screen. If there no solution to this, I might end up returning it back to amazon.

Hello Nenvue78,
For individual cases, I would recommend a dedicated support ticket rather than this busy generic thread.
If you send an email to technical_enquiries@displaylink.com, stating what you are trying to achieve (how many displays, in which configuration), and with what machine (Apple product name and model year) and product (the one you got from Amazon), then we can guide you how to achieve this, or tell you straight away if it's not possible today.
Kind regards,
Alban

Well done! Has restored my 3rd display on Mac Mini (Late 2014)

Screen working again!
 

With the installation of the newest driver, my second monitor came back to live. Thanks! :):):):):)
My specs:

• Macbook pro 13 inch mid 2012
• macOS 10.13.4 (17E202)
• Kernel version Darwin 17.5.0
• USB32hdpro Startech