Not surprised. PeerCube users typically catch this quickly because system auto tweets when new loans are detected. Some users also review available loans manually on PeerCube. If they get too many loan ID not found, they know something is not right. I usually get pinged quickly.
I didn't understand LC explanation for the issue. It seems they have been mucking around with 3rd party service provider accounts. Luckily, the 401 response led me to the right path of troubleshooting. I was able to figure out through trial-and-error the issue and workaround before LC could resolve issue on their end.