Mac OS 26.1 blocking Displaylink
 

I have a similar problem; a Macbook air working satisfactorily with Displaylink on Mac OS 26.01 but has stopped working on MacOS upgrade to 26.1.
I have tried all the troubleshooting I can including safe mode and accessory permissions, reinstalling Displaylink 14.1 but without success. Any clues anyone?

An old lesson relearnt
 

Now feeling very silly; rebooting my docking station solved the problem!

Same issue, M4 Pro, Dell U2412M, Dell dock UD22, DisplayLink manager 14.2.0, unplugging the power usually helps, but every time the laptop is locked I need to unplug the monitor power again which is ridiculous...