After upgrading existing, and thus working, Windows 7/W2K8 R2 systems to service pack 1, it is no longer possible to logon into domain on these systems. The message is "Trust relationship between this workstation and primary domain failed". The necessary registry changes are in place!
The same happens on systems freshly installed with Win7 or W2K8 R2 with integrated sp1.
after applying windows updates, available just after installation of sp1, one of them seams to have fixed this issue. updates applied: