I suggest that you temporarily enable the Debugger in the form On Submit event so that you can see the MySQL query that is being created. That should help you diagnose the problem here.
Bob
PS You should also try clearing the ChronoForms cache if you have added a new column to the table.
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Easiest solution is to use v7 and in the "Save Data" action, use the "Data sources" advanced setting, then add a new table field "name" and set the value to {user:name}
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