After I installed service pack 2 on one of our Vista (amd64) workstations the group policy preferences stopped applying. The preferences are still working on our xp sp3 and vista sp1 workstations.
This is happening in a pure Windows 2003 domain without any Windows 2008 servers.
I have seen this: http://blog.mpecsinc.ca/2009/05/vista-service-pack-2-not-applying-group.html but that can't be the way to install the client right?