Hi

When I try to access the developer section in my Umbraco solution, I am thrown to the login screen page with the message:

Session timed out. Log in below

In the browser console, I can se errors where it says 'Unauthorized' and if I follow the link directly to the section as here:

http://mydomain.dk/umbraco/backoffice/UmbracoTrees/ApplicationTree/GetApplicationTrees?application=developer&tree=&isDialog=false

A blank page appears with the message:

 )]}',
 {"Message":"Authorization has been denied for this request."} 

I am logged in as an Administrator with full access to all the sections. The Umbraco version is 7.5.9.

Does anyone have any clue, it is very much appreciated.

Best regards.