Latest version doesn't mean anything because it can be 22.5.4.24 or 22.5.5.x. If you did manage to get 22.5.4.x, then that might be where the problem is. I've ran both Norton Internet Security 2016...

What version was the Norton specifically? Wonder is it related to this:
Both Norton Windows Defender are Inactive after 22.5.5.14 update | Norton Community