I just bought a UD-3900z and am having trouble connecting a Dell monitor using a DVI to HDMI adapter (Apple OEM). I have installed the DisplayLink driver and followed the instructions. I have tried connecting to a Macbook Air M1 model via USB-C as well as an older Macbook Pro via USB 3.0 and neither one worked.
I can connect the monitor directly to the Macbook Pro via the HDMI port, so the problem is not with the cable or adapter.
I’ve tried both the HDMI 1 and HDMI 2 ports on the Plugable device with no change.
Any other ideas for what to try?