In previous versions of Kentico it used to be that when you want to edit a permissions matrix (CMS Site Manager > Administration > Permissions) you would first select the site in the first dropdown, and then the items in the third dropdown were filtered by site. So you would only see the document types for the selected site.

This no longer works in Kentico 5.5.0 and it seems like a regression bug, there is no possible use in setting a permission matrix for a document type that is not part of the selected site.

Please look into this, because in multi-site installations, the list of document types becomes very long, and sometimes the names of document types are the same, so it's not even possible to set the permission matrix (because you don't know if you have selected the right document type).

In other words, this bug makes correct setting of permission matrix impossible in supported scenarios (multi-site, separated doctypes)!

Thanks for looking!