I can no longer login after 4.2.2. upgrade

I was able to login over the weekend, but this morning, I can’t get into either of my WP sites. Login screen just refreshes to the same screen. If I use wrong password, it says so, so it seems to be accepting the password. I tried resetting the password, anyway, but the email link for resetting the password says, “Sorry, that key does not appear to be valid.” I can reset the password using the edit link in Softaculous, but, again, my login screen just refreshes to the same login screen with no errors. I’ve cleared my browser cache and cookies (and tried other browsers that had never been used for logging in). Nothing works. Thoughts? This seemed to start after the 4.2.2 update.