Sorry I cannot lend a hand but I am trying to give back in small measure as everyone on this site is so great in thier help to me. I do agree this sounds like something to do with the AD (schema) and it's interaction with Kix. When we updated our AD to 2008 here where I work, we did have to bring microsoft in to build a special hotfix for some various issues that arose out of updating our AD to 2008. Hope this helps some.

Syn
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Bang that head that doesn't bang!!!