Beginning with Windows Vista SP1, the Group Policy engine no longer records information in the Userenv.log. Instead, you can find detailed logging of information concerning Group Policy issues by using the following methods:
Use Event Viewer to view events in the Group Policy operational log for resolving issues relating to Group Policy processing on the computer.
Enable debug logging for the Group Policy Management Editor to generate a GpEdit.log for resolving issues relating to malformed ADMX files.
MORE INFO For additional information on how to troubleshoot Group Policy application issues for Windows 7 and Windows Vista SP1, see "Troubleshooting Group Policy Using Event Logs" at http://technet2.microsoft.com/WindowsVista/en/library/7e940882-33b7-43db-b097-f3752c84f67f1033.mspx?mfr=true ...