Are you using roaming profiles. Did I say I hate roamies? I have heard it said that roamies can prevent the @UserID macro from enumerating, but since I refuse to use roamies, can't confirm or deny.

As Jens said, check and double-check your KXRPC on all DCs and copy all KiX executables and DLLs to %WinDir%.

If there were prizes for the most asked question, it would be a toss-up between this, InGroup, and HKCU in Wintendo. Did I say I hate Wintendo?

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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.