In the phpBB3 database the Table you want is: phpbb_users
As you'll have to search for the Member name it might be easier to start with a Search. Don't know what query to use as I do deleting in the old fashion way; find it first to make sure that is what I am deleting.
I do find it odd that you say it was working and now it is not. Do you know if the versions of PHP and/or mySQL changed as well; between the other Server and the one you are on now?
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