I have two monitors that have been working happily with a UD-3900 for years. My UD-3900 stopped working so I got a UH-5900. My DVI connected monitor works perfect but the monitor with the HDMI to DVI adapter does not. If I plug this directly into my laptop then the monitor pops up in extended mode perfectly well.
Connect it to the UD-5900 and it isn’t found by Windows 10.