Wireless mouse stopped working with monitor USB port Setup:
* MacBook Pro 2017
* Mojave
* DELL U2717D Display
* Logitech unifying receiver and mouse m705  

Mouse &amp; receiver work have worked for a year. I upgraded to Mojave 2 weeks ago, and it has been working fine for the last two weeks.

Beginning today 10/7/18, mouse no longer works when the receiver is plugged into any port on monitor. 

Mouse works when receiver is plugged into Mac with USB C adapter.

I checked USB ports on the monitor and they still work with other USB devices.

I checked with two different Logitech receivers and mice and neither worked.

I reinstalled the Logitech software and restarted.

Still doesn't work.

I'm stumped. Does anyone else have any ideas?
Shutting down the Mac, unplugging all the cables from the monitor, and unplugging monitor power for several minutes solved the problem.

I had tried unplugging the monitor briefly earlier, but that was insufficient.