Report bugs with the SourceForge.net bug tracker  (http://sourceforge.net/tracker/?group_id=142769&atid=753557).

The JSON JavaScript library (http://www.crockford.com/JSON/js.html) fails to encode associative arrays which means it is not possible to pass associative arrays from client to server at the moment. The other way, from server (PHP) to client (JavaScript), does work though!