Hello,
I have the same Problem.
I tried already all three workarounds:
https://support.displaylink.com/know...ing-permission
https://support.displaylink.com/know...-functionality
https://support.displaylink.com/know...r-only-one-mon
Nothing helps.
I also downgraded again to Mojave and tried different Versions of the DisplayLink driver on Mojave and Catalina.
I have also the problem that some applications are not working or not working properly when I'm in Camshell mode.
- Final Cut Pro X is not starting at all.
- Affinity Designer is starting, but if I try to create a new Document, I got only the "loading ball" and that's it.
- Affinity Photo for example is working properly.
If I'm not in the Camshell mode, so Macbook display is still opended and working, then I don't have problems with the applications. Also after enabling Camshell mode after starting the applications, everything is working. But if I'm opening the Macbook again, internal Display stays black.