View on browser not displaying any documents

We are currently in the progress of migrating from R5 to R6 and have moved a browser based application into the new live R6 environment and it works fine.

However on our development R6 server when opening a page which includes a single category embedded view (based on common name) no documents are displayed. In fact any view opened within the browser does not contain documents.

Am pretty sure it is not the application, as it works on a different server. Is the development server missing something or is there a setting on the server document which is incorrect ?