I did this to make it work after I make all types of changes, make new app, reset secret, permissions, etc…
This work for me!
GOTO:
Permissions (the 2nd in left menu)
Configuring Permissions:
“Configure your permissions” search for “Auth Token Parameter:”
if “Query String (?code=…)” change to URI Fragment (#acces_token=…)
Now you can grant permissions!!! F#K
http://wordpress.org/extend/plugins/facebook-page-publish/