We have an urgent problem since we upgraded to 5.2.11 We are unable to edit products, product groups, shop setting (config) or email templates while we can still work with orders and customers. Trying to edit a product (product list in fine), we just see the tabs and a white screen below the tabs. In addition the shop works much slower than usual. Any hints? Thanks. Server log shows: client denied by server configuration: /home/kamagras/public_html/includes/ckeditor/ckeditor.js, referer: http://kamagra-shop-deutschland.com/admin.php?_g=products