Since the latest Norton update, early September, emails are blank in the view display window or if I select the email. But if I select forward or reply from view display then the email contents appear fine. Sometimes restarting my Mac a couple of times seems to fix it too, but only for a while then the problem returns.
Curious, Norton AntiTrack page here states: ** Private Email feature is available for Windows only.
And…Fix email issues appearing in Private Email > Blank page appears instead of real email here points to Mac/Safari?