A couple more issues that have come up with my conversion to Windows 10 and Kaspersky on one machine (HP Envy).
Update: Oct. 8
I've noticed that when some images are imported by Blogger in a Windows 10 environment, and then fixed manually in html with respect to height and width, they view OK in ordinary browsers but may not be viewable in blogs enabled by https. Also, the images are not viewable on the Blogger panel which is already under https. It appears that Windows 10 is encrypting some images that algorithms tell it contain text and conceivably some PII.