With the plans to move to 2008 right away, I don't think I would chase this too far. It sounds most like a "feature" with 2000. I haven't seen that happen in 2000, and none of my 2008 instances are exhibiting that kind of behavior.
Jason...AKA CirqueDeSQLeil
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I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
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