This just started happening a couple weeks ago. I've made no hardware changes, and the only possible changes are from Windows updates.
Windows 10, up-to-date.
Mumble, latest version (1.2.19)
Logitech G11 keyboard
Logitech M510 mouse
Logitech Clear Chat Pro USB headset
When I plug in the headset and fire up Mumble, I'm no longer able to use the keyboard. The G11 lights up when plugged in, and it's staying lit up...but no keys work. As soon as I shut down Mumble, it starts working fine.
Keyboard works fine everywhere else, with any other software, just as it should.
I've tried plugging mouse and headset into different USB ports, but none of the possible combinations works.
Let me know if there are other details needed to help troubleshoot this. Thanks!