This beggars belief!
Both the built-in USB 3.0 front panel port and the USB 3.0 hub are designed to plug into rear-mounted USB ports. Since my motherboard has an on-board dual-port header I purchased an "external to internal adapter cable" from Amazon, the product is made by Silverstone (see here
Just plugging in this (one would think) electrically neutral cable (connected to NOTHING) is enough to cause my system to mis-report the screen resolution as 1920 x 1080 instead of the correct 1920 x 1200!
Who would believe something so silly? I wouldn't if I hadn't seen it with my own eyes. As it happens I had bought two of these cables, I have tried both with identical results.
I guess all that remains is to try plugging both USB 3.0 devices into back-panel USB 3.0 ports to see what happens (I suspect the hub WILL interfere with shutting down the computer - but let's see!).
@ACR731, no, I hadn't tried that - but I will once my USB 3.0 adventure has run its course :-)