Web service test client problem

Hello there,

I have a moodle 2.4 running with a PostgreSQL DB, both in localhost. when i try to run the test client, it returns the URL and nothing more, and doesnt write any changes in the DB... I tried this before with MySQL and Moodle 2.1 and worked. Permissions are all granted, protocols are enabled too... Any ideas what might be the problem?

Thank you in advance!