And simple question: why would you want to run user logon script on servers?!?!?
even thou they might not do any harm to the machine/system, it's not wise to do with server anything that ain't planned for: serving.
and even, I might suggest that you take of every logon script from the D_Admins and then use less powerfull user to do thinks that do need the logonscript.
well... discussion can keep on going, but...
suppose:
IF (INGROUP("Domain Admins") <> 0 AND $rtn="SERVERNT")
wont work.
what says then only either one?
try to make the script speak to you when it runs. nothing nice in the beginning. I use "I am here" and "in the if jubby"...

coding is boring if you don't want to search the error when the syntax is correct. 'cause it can take up lots of time.