I ran the troubleshooter; it did not detect a problem.
My build is 10240.
Everything swears I'm up to date. I'm NOT running 1511 obviously.
I KNEW the MS rep was BS. I just joined this forum to...

All the articles on this update fail to specify Home or Pro!
I have Pro, and have not received the update. It would stand to reason that the number 1511 would be reserved for one or the other...