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just to inform you guys that ghost users problem is fixed in following update 1.9.
However you will have to remove existing ghosts manually.
Go to your database > wp_postmeta. Search meta key clan and copy its meta value.
Example of meta value:
Go to http://www.unserialize.com/ paste this meta value there and you will get user ID(s) of ghost users.
You will have to check if that ID exists in back end.