Missing header nav in front office for Guests (visible only for administrators)

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Hello C5 Community,

I hope you'll be able to help:
Recently my header auto navigation simply vanished, but what's most amazing, only for unregistered Guests. When I log in to my admin or editor account everything seems to work/look fine. I believe that's permissions issue. It seems appeared for the first time, when I have changed sites permissions for two Global Areas in Dashboard > Full sitemap > Stacks > Header nav / Footer. I allow or in fact I was going to let my Editor group publish any changes made in header or footer without a need of any additional approval. For footer it worked like a charm but unfortunatelly for header didn't. Since then I have no navigation for visitors.

Have you got any clue how to deal with this? I use simple permissions.

Regards,
Peter