Can't add new pages after updating from 5.5.0 to 5.5.1

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When I add a new page in concrete5 5.5.1, i get the popup to select the theme, i choose one, then I get:

Page Not Found
No page could be found at this address.

What I can do?

 
Magneticdud replied on at Permalink Best Answer Reply
I solved the problem, it was mod_pagespeed interfering with the code

http://www.dandandin.net/concrete5-does-not-work-with-mod_pagespeed...