Thank you Mika! BTW, the first several recommendations at halfelf.org did not work, but step 6 (“Kick wp-config in the butt”) did finally fix the “login loop.” And what, btw, are “salts/hashes”? What do they mean/do; does each site have them, somehow; what’s the difference between the ones I had and the new ones?
The more I work with WP the more I learn, and the more I realize I don’t know! I guess I need to study php a lot more…