Since you're using a login.bat, just add a PAUSE at the end, after the kix command. This will leave the window open with any messages. Kix might be throwing an error that you don't see because the window closes.

Also - try running the command manually:
 Code:
\\MyDomain\netlogon\kix32.exe \\MyDomain\netlogon\kixtart.kix
Also - ".SCR" has been deprecated - you should use ".KIX", as .SCR is associated with screen savers.

Glenn
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Actually I am a Rocket Scientist! \:D