If no logging at all is taking place, try the troubleshooting approach used in the following example. It is designed to help you work out which configuration settings are being read, establish where they are being read from (when multiple ADM files are present), and check that the log file correctly tracks changes made to profiles. The strategy creates a small test OU to which a test user logs on, allowing you to create profile modifications that you then track in the log file and Resultant Set of Policies (RSoP) report.
The deployment in this example has XenApp servers running on Windows Server 2003 with users connecting to their published resources using the Plug-in for Hosted Apps for Windows. The deployment uses OU-based GPOs. INI file-based configuration is not used.