I'm having a similar problem. I recently gave a member Static Page Admin rights, but now for some reason I can't edit any static pages I previously made and I don't have a link to mysite.com/public_html/staticpages/index.php in the Admin's only block - even when I'm logged in as the Admin. When I go there i get this message:
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Access to this page is denied. Either the page has been moved/removed or you do not have sufficient permissions.
The Static Page Admin box is checked for Admin and my username. What do I need to change to make this work again?