The 10.13: High Sierra Thread

[JimLondon1]

I am running 2 x VGA displays via USB-C-to-VGA and HDMI-to-VGA adaptors from a late 2012 Mac Mini on High Sierra. I am trying to run a 3rd VGA display via a DisplayLink USB 3-to-VGA adaptor. The driver was initially blocked by security but I clicked allow. It is recognised in the System Hardware list - screen grab attached. Also attached, a Verbose report using your Support Tool.

The screens are being shared with other computers via an Adder KVM switch but I've tried adding the 3rd monitor/DisplayLink adaptor directly to a stand alone VGA monitor with the same result. All screens are fairly ancient 17in Dell IXODs

Connecting the adapter alone causes no change. Attaching the display to the adaptor causes the other two screens to go dark and the system to be completely unresponsive, after which a forced shutdown is needed. Hence, the report was created with only the adaptor attached.