I noticed that WU came in at 7:42am. MSE had not updated the defs on Aug 10th before or at that time.

Tnx for giving your time to the issue. As no-one else chimed in I assume there will be no answers here. As I have no control over MSE optional updates, even though I have 'notify, and I chose when to download in WU', I have no trust that his is not going to happen again. I will be uninstalling MSE/Windows Defender today. There are 3rd party antivirus apps out there that I can chose from.