Monterey + D6000 - Background images revert to default at login
 

Upon login, 2 out of my 3 screens are set back to the default Monterey background image every time. The behaviour is the same whether I logout and login or reboot.

Details:
Mac OS Monterey 12.6
Displaylink driver 1.7.1
Login extensions installed
MacBook Pro M1 (16-inch, 2021)
Dell D6000 on A04 (latest firmware)
2x External Screens using Display ports
Filevault is enabled

Anyone else seen this?