Yes, the event log on the client. Have you tried Jens' code? Try it with a well known group as well. just run a little mini-script from a DOS box.

code:
Break on
IF InGroup('Domain Users')
  ? 'InGroup Domain Users works'
ELSE
  ? 'InGroup Domain Users Failed'
ENDIF

IF InGroup('PRT-1-5-HP8000')
  ? 'InGroup PRT-1-5-HP8000 works'
ELSE
  ? 'InGroup PRT-1-5-HP8000 Failed'
ENDIF
get $
Also try running it with KiX32 /f
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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.