Hello.
I see you posted on the 3650 M2 discussion as well - have you updated to the UEFI 1.03 firmware? It seems that this resolves some of the weird USB-related issues.
Good Luck!
Thanks for the response, I didn't get a chance to upgrade whilst at the site, but will try it next time.
Cheers
It seems that this is a residue of the uefi update. Still not sure what it does, but its not doing any harm that I can see, except for confusing users!