Agreed, that's a common headache after major updates. A quick tip: after you re-lock everything down, consider exporting your privacy settings as a backup for next time.
Agreed. You could also run the built-in privacy troubleshooter, which sometimes catches and fixes these permission conflicts automatically. Hope that helps.
You could also try creating a fresh local user profile, as the upgrade might have corrupted some settings in your current one. Let me know if that works.