I ran into a rather strange error today when trying to run Group Policy Modeling on a user. Instead of showing me Summary and Settings I received an error stating that The given Key was not present in the dictionary.
At first I thought that maybe we had used some Norwegian characters somewhere in a policy, but after some googling it turns out that this is caused by ticking the parent registry container when using the Registry Wizard to create a gpo registry preference.
Microsoft has published a kb article about it here: http://support.microsoft.com/kb/2692409
However the resolution they are presenting is useless for most organizations I think. Recreating all registry collections is not an option, at least it wasn’t for us.
So here’s how to do it in a less time consuming manor (but it may still take some time):
The setting you need to delete here is TimeZoneInformation, you can spot them by the icon (the regedit icon) and by the fact that they have a blank Type.
After deleting all of this type of entries you can rerun your query and it will work as it should