Hi, regarding my original post - it turned out to be a hardware issue with the DP ports.
I got my docking station replaced by the store where i bought it.

Mine also stopped working after update to Ventura 13.1
I reinstalled everything and also gave it the required permissions but still no luck.

I've read somewhere else that the firmware update to version "A03" could help. However this firmware has been removed from the official DELL website and I can't find it.
If anyone has this exact version of firmware for D6000, can you send it to me in PM?
The filename is: Dock_D6000_FW_Updater_A03_T8Y8T.exe

Thanks

Same problem, M1 Air, 2 Dell US 49DW
 

I have the same problem with one out of 2 D6000 Docks

Suddenly it stopped working after working fine for more than 2 years now.
Mac OS Sonoma 14.1
DL Manager 1.10

but also not working with my Lenovo X13 and Windows 11

Both machines work fine with another D6000 connected to the same screens ( We have the exact same setup twice.)

Firmware was updated to A04, still no luck.