As many of you know Group Policy troubleshooting can be a bit of a challenge. If you have not made use of the Group Policy operational logs that were introduced in Windows Vista, you are missing out on an extremely handy troubleshooting tool. On any Vista or newer system, open the event viewer (eventvwr from the run command) and browse to Applications and Services Logs/Microsoft/Windows/GroupPolicy. Under this folder you will find very detailed event logs associated with Group Policy. The information that formerly was found in userenv.log is now available here. Among many other advantages this new format allows you to easily see all events that relate only to GP. To get you started, the categories of events that you will be found are as follows:
Hopefully you all find this helpful.
Group Policy PM