Thank you so much for reaching out to us, I am sorry to hear that you are running into this issue, but I would be more than happy to assist!
The UD-CAM can only be utilized with very specific USB-C cables, due to the features of the dock. The Apple USB-C cable does not allow for Power Delivery, VESA Alt-Mode, and Data via the same connection, so this may not have been a needed test, but I appreciate you trying it out.
Thank you for sending over the specifications of your display, this can always help a lot when attempting to isolate the issue down. Based on the specification of the display, it should be compatible with the docking station, as long as a direct HDMI to HDMI cable is being used (which I think you confirmed by saying “standard HDMI cable”)
The UD-CAM is driverless, and does not utilize DisplayLink based chipsets to output to a connected display, so the driver installation is not required. Due to recent incompatibility issues with the current macOS update in 10.13.4+, I would advise uninstalling the DisplayLink drivers, just to make sure this is not causing any communication issues.
When the dock is connect to your system, does the indication light on the front activate once the power button is pressed? Do the USB ports and Ethernet function, while the HDMI port is not functioning?
Thank you for your patience,
Product Owner & Technical Support