During the rebuilding of your site, the value's for the validationKey and decriptionKey attributes in the <machineKey . . . /> node of the site's web.config file must have changed.

Were you able to restore the web.config file from the old site's files and if not, do you still have a copy of it available?

When you say that you have been re-building the site, did you perhaps do a new install of DotNetNuke then restore only the database from a backup?

Are you able to log into the re-built site as admin or host user? If so, please check the Admin-->Event Viewer for more detailed errors that might be logged when you tried to change passwords of existing user accounts.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner