It's a known bug in 4.60. Any version prior to that and you can simply specify "kix32.exe" in the user profile. For version 4.60, you have to specify "kix32.exe kixtart.kix" in the user profile. It's one of the reasons we us 4.60 for admin scripting but 4.53 for our login scripts.
Kix always supported @USERID.KIX for custom login scripts - only the default script is broken.
When you have hard to explain problems, you should always review the Beta forum, since these types of things are discussed there. You'd either have more hair or would be able to sit more comfortably if you had, depending on whether it was a PITA or hair-pulling problem. 
Glenn
_________________________
Actually I
am a Rocket Scientist!
