Thank you for contacting Plugable support. I understand that you are having an issue with your “second monitor not being detected via the DVI port on the plugable UD3900” and would be happy to investigate and find a solution.
Thank you for also providing us with the steps you have already taken. This is appreciated.
At your convenience, on your Windows 10 system, could you please collect a set of diagnostic logs generated by our PlugDebug utility? It will gather device information and installation logs that will help our support team understand what could be happening.
To collect these logs, please have the device plugged into your computer running Windows 10, then go to this page and follow the instructions there:
The tool will collect system logs into a ZIP file and save them to your Desktop.
Please send this file to email@example.com.
These log files combined with the problem description you’ve provided will help us understand what’s happening and provide the best next steps.
*** If you could also please include the Amazon Order ID number for your Plugable dock purchase that would also be appreciated. ***