There is a line in the queryobj.php where you can turn on and off error messages like:
$this->Debug = true;
However, just because a record isn't updating doesn't mean there is an error. It could just be that the record isn't found and can't be updated.
You may want to debug by writing all of the information from the insert after the execute like:
$InsertQuery->execute();
var_dump($InsertQuery);
die();