You mind running a test vb script?

Got it from this sight, which describes some potential errors encountered when using the memberof function, which is what EnumComputerInGroups and ComputerInGroup uses.

http://www.rlmueller.net/MemberOf.htm

Not sure if it's helpful, but it's something.

 Code:
Set objSysInfo = CreateObject("ADSystemInfo")
strUserDN = objSysInfo.computername
Set objUser = GetObject("LDAP://" & strUserDN)
On Error Resume Next
arrGroups = objUser.GetEx("memberOf")
If (Err.Number <> 0) Then
    On Error GoTo 0
    Wscript.Echo "Member of no groups"
Else
    On Error GoTo 0
    For Each strGroup In arrGroups
        Wscript.Echo "Member of group " & strGroup
    Next
End If

Edited by ShaneEP (2011-12-15 07:27 PM)
Edit Reason: pasted wrong example...