I have two UD_CAM docks and both have the same issue.
If i boot my laptop (Dell XPS 15 Windows 10) with the dock plugged in everything works fine.
Monitor via HDMI
USB ports all work (wireless MS keyboard dongle)
If I unplug the USB-C cable and then plug it back in, the power delivery comes back and the Monitor comes back but the USB ports no longer function.
They will only function when booted with the cable plugged in
I am fairly sure this is a new problem and fell like it is probably a windows driver or group policy thing from my company