you shouldn't lose any of your members during an upgrade. However, you will have to re-translate much of your board. It especially depends on what version you're upgrading from as to how many cgi files will need to be replaced.

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Doug
darksaber.hispeed.com
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the Land of Mordor where the Shadows lie.
--J.R.R. Tolkien, The Lord of the Rings