I had a 1.6.2 Feng and I have tried the update to 1.7.
I unzipped the files into the directory and I accessed the public/upgrade address and everything was ok.
Nevertheless when I access to the site I can see none of my content. The only thing that are shown are the header with the Feng Logo and the little menu in the upper right corner with the items: "logout", "administration", "account" and "help". When I try one of these links they open a new window with the same content as before.
Right below these I can see the footer of the application with FengOffice site link
After activating the debug mode, I get the following errors:
Trying to logout:
Fatal error: Undefined class constant 'ACTION_LOGOUT' in [SITEFOLDER]/application/controllers/AccessController.class.php on line 412
Trying to access into "account":
Fatal error: Call to undefined method User::isGuest() in /[SITEFOLDER]/application/helpers/permissions.php on line 40
I have tryed with two different browsers (Midori and Iceweasel) with the whole cache cleaned and even with the private mode of Iceweasel.
Any ideas?