Node uid = 0 if "Change the name of the authoring user" is off.

When you switch "Change the name of the authoring user" to off in "/admin/settings/publishing_options" the uid of new nodes is always 0

Oliver

Original:

  if (user_access('administer nodes')) {
    // Populate the "authored by" field.
    if ($account = user_load(array('name' => $node->name))) {
      $node->uid = $account->uid;
    }
    else {
      $node->uid = 0;
    }
  }

Patch:

  if (user_access('administer nodes')) {
    // Populate the "authored by" field.
    if ($account = user_load(array('name' => $node->name))) {
	  if($account->uid > 0){
      	$node->uid = $account->uid;
	  }
	  else {
	  	$node->uid = $user->uid;
	  }
    }
    else {
      $node->uid = 0;
    }
  }