I upgraded Kixtart from 4.53 to 4.61 and right after I did so. Any logon script that would run would fire the error: "ERROR : invalid method/function call: missing required parameter 2!". Checked Event Viewer and Event ID # 1 was logged several times.

"Event Type: Error
Event Source: KIXTART
Event Category: None
Event ID: 1
Date: 5/25/2010
Time: 12:23:07 PM
User: N/A
Computer: LHX002CE8470MNB
Description:
The description for Event ID ( 1 ) in Source ( KIXTART ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event:
ERROR : invalid method/function call: missing required parameter 2!
Script: C:\DOCUME~1\ptruini\LOCALS~1\Temp\UHGLS\Logon.KIX
Line : 201
Error : Incorrect function. (0x1/1).

I downgraded to 4.60 and the problem immediately went away. I put 4.61 back, and the error came back, put 4.60 back once again and the error went away and Kixtart ran normally. Back to the drawing board...