markus79,
You do need to do some investigation.. and make sure the subscribers password wasn't "leaked" thru a brute force attack or similar.
I usually contact them, and issue a new password.
If that new password appears on the PWSites, then I would cancel the prick and lock him out.
Your site should have a warning somewhere inside your site, saying that you take password swapping very seriously, and that membes will be cancelled. THat usually will keep them under control.
DD
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