When I log in, neither of my USB devices is seen. It's really driving me round the bend, I have USB keyboard and mouse connected. I have to unplug them then plug again and only then it works correctly.
I have a similar issue with a wireless mouse that sometimes fails to boot up. Unplugging and re-plugging the receiver solves it. Someone once told me the receivers 'wear out'. Certainly it never used to happen, and the mouse concerned is getting old (i.e. about a year).
But IDK why a wired USB would fail in this way. (Or are we talking about a wireless k/b & mouse here?)