Connector configuration tab in connector modal page does not accept new values

To reproduce the problem:
1) launch Syncope in embedded mode.
2) log into console and open resources page, then click on connector tab and edit a connector (ApacheDS is a good example).
3) Edit, for example listening, port for connector ApacheDS, edit other fields and save.
4) Open connector just updated and you will notice that values haven't changed and modifications haven't been submitted.

Notes:
some values are updated during submit, other values (as port number) not. More problematic fields are numeric ones (port number, Change Log Block Size), which are never updated.