wow. I am installing the beta upgrade now. You have twice the ram i do so i'm going to take a look at come basic kernel tuning and see if that's an issue..

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50 user home license:ASL 7.5x p-4 xeon 2.8 ghz HT, 2 gigs ram, 250 gig HDD, 2 x Intel gig-e, 3com 3c905B

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