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With FileMaker Advanced, you can produce a database design report and open it in a Web Browser. There, you can do a text search for the name of the field. If the field name is pretty generic, you can temporarily renamed the field in Manage | Database before generating the report to make it easier to find without hitting on other text.
But your field might clear itself without a script being the culprit (though it would be my first guess also.)
Check for an auto-enter calculation that might clear it.
Also, changing the value list values for the field or assigning a new value list with different values may cause a field to look like it is empty if the value in the field does not exactly match a value in the field's radio button value list.