OK - I think I know where your confusion stems from. The Logitech driver is NOT broken, it is a problem
with the underlying USB driver that is broken. If it was the Logitech driver that had a problem, the workaround I suggested would not have worked at all for anybody. It seems to be working ~100% for 3 people. Give it a try. When they announce they have a fix (or fixes - may take more than 1) for the USB
driver, back the workaround out and see if the problem with the Logitech keyboard goes away. If it doesn't, then Gordon has more work to do.
And you can put the workaround back and keep on computing
You are in a maze of twisty little passages, all alike.
When General Failure and Major Disaster get together, Private Parts usually suffers.