When trying to edit the properties for any element using eZStyleEditor, the properties popup dialog will be stuck in the "loading" stage forever. Looking at the network traffic through Firebug or the Chrome developer console. it's possible to verify that the response from the server is a mix between JSON and HTML character entities, leading to an invalid message that cannot be parsed. However, no Javascript errors are visible in the console.

Example response for: (editing the properties for "Header 1" on Webin): http://ezp.filipe.cleverti.qa.ezpublish.no/ezjscore/call/ezcsse::getelementstyles?Params%5Belement%5D%5Bclass%5D=&Params%5Belement%5D%5Bid%5D=&Params%5Belement%5D%5Bname%5D=&Params%5Brule%5D%5Balias%5D=Header%201&Params%5Brule%5D%5Bselector%5D=h1%2C%20div.attribute-header%20h1%2C%20div.attribute-header%20h1.long&ezxform_token=a9ccadedfefbfde3dae39f70e9fa2d69

Response body:

{ "properties" : [  ], "selector" : "h1, div.attribute-header h1, div.attribute-header h1.long", "alias" : "Header 1" }

This happens for, as far as I could assert, all eZStyleEditor AJAX calls.

Steps to reproduce

1. Enable eZStyleEditor through the toolbar icon
2. Select "Elements" on the top-left and any element from the list
3. Verify that the contents of the dialog are never loaded, and instead you get an endless "Loading" message