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Thanks for replying agsteele but please see for this portion of op "......Tried rebooting, removing & reinstalling unified receiver....." I haven't gone through an exhaustive tear down of uninstalls, reinstalls and updates yet but this gives me pause as to why this would happen. I'm somewhat surprised that no one else has experienced this (no one else in this forum or aware of the forum anyway). I have gone through several iterations of Evernote updates as I'm a long time user and have never had any issues. I have been around computers long enough to remember IRQ conflicts and all flavors of compatibility issues, as I've said before this particular issue reminds me of those type of problems.

Logitech K750, USB unifying receiver, MX Ergo mouse - keyboard stops working, mouse works, after latest Evernote update (not sure what vers #) Uninstalled Evernote and the keyboard works fine. Tried rebooting, removing & reinstalling unified receiver, I'm pretty sure it's the Evernote update. Why is it messing with USB function??? Is this a 1995 problem with interrupts?