Kinda stumped and sorta feeling like I'm missing something obvious here but........
Installed the new update to Ver.1511 Build 10586.14 and after all the restarts etc plugged my external Passport Ultra into the usb3 port I always or usually do and Windows doesn't "see" it at all. Same with another Toshiba external. I can switch it to a usb2 port and it works just fine. The usb3 ports "see" usb2 devices (thumb drive and mouse donggle) but not the usb3 devices. All drivers are working and up to date. So......... what am I going to be embarrassed about for overlooking?