Page Settings and Dashboard side-panels saying "Access Denied" when clicked after upgrading to 18.104.22.168 user found helpful
Here's what happens:
1. I manually upgraded from 22.214.171.124 to 126.96.36.199 by putting the new core in /updates and running the script in /dashboard/system/backup/update/.
2. Now, clicking on the dashboard side panel displays a raw "Access Denied" message and nothing else:http://i.imgur.com/g5d9ofL.png
3. Going straight to the dashboard by typinghttp://www.mysite.com/dashboard works normally. I can do everything from there.
4. Additionally, clicking the "Page Settings" cogwheel on any page does nothing, i.e. the site moves to the right as though it tries to load the menus, but nothing happens.
try_files $uri $uri/ /index.php/$request_uri;
The problem was concrete5 was not able to get the query string without this for some reason.
where did you do this edit?