Thank you for contacting Plugable support! Sorry to hear about this issue. I’d be more than happy to assist you.
Please note, we don’t officially support macOS with our DisplayLink-based docking stations and USB graphics adapters, as there have been historical driver incompatibilities in the past. (We do mention this on our website and product listing, but realize it can be easy to miss.) To date there has been significant progress made by DisplayLink with macOS Mojave and Catalina with an updated driver and most of our customers report good results with this setup, but we still encounter issues from time to time that have prevented us from officially supporting DisplayLink on Mac. For the issue at hand, since Big Sur is still in beta, we’re not performing extensive testing as Plugable doesn’t develop the drivers. When an official DisplayLink driver for the final Big Sur is available, we may reevaluate our stance. However, please note that for the time being we may be limited in the support we can provide.
To try to see if we can help here, can you confirm which HDMI port on the dock is causing the issue? The UD-ULTCDL has both a 4K HDMI and a 2K HDMI (the 2K is controlled via DisplayLink).
I didn’t see anything too helpful in the error details generated by the OS so I’d like to get more diagnostics if possible. We have a troubleshooting tool that helps us find out what is going on in situations like this. Please plug the dock into your computer, then go to this page and follow the instructions there:
(Since the dock with HDMI connected causes a crash, you can leave your display disconnected.)
You can reference ticket 323212 so that the diagnostics get back to me to take a look at.
Please don’t hesitate to let us know of other questions.
Thanks again for contacting Plugable support and best wishes!
Senior Engineer | Product Owner