node content not displayed anymore after update

Hi fago,
thanks for your reply and sorry for the delay.
I tested each possible output variant, without any effect.
But I noticed something else as I changed my usernode template file: I didn't use the $content variable of the usernode inside the template file to print out the nodeprofiles. My approach was to put the nodeprofiles in two columns in two variables ('nodeprofiles_col1', 'nodeprofiles_col2') inside the template.php (see below) and to print them out inside the usernode template file. When I print the $content variable, the nodeprofiles appear.
But the strange thing is, that up to now, my approach worked fine, and works again if I uncheck the 'use as nodeprofile' checkbox for each of the node types and mark them as childnodes of usernode via the userfamily module.
So, all in all, I think, it's not a bug, but maybe something has changed in how the nodeprofile module 'delivers' the nodeprofile contents ?
Here is what I put in the _phptemplate_variables() function inside template.php:

$variables = array(); 
switch ($hook) {
  case 'page':
    if (arg(0)=='usernode' || arg(0)=='node' && is_numeric(arg(1))){
      // Get the currently logged in user. 
      global $user;

      $types_col1 = array();
      $types_col2 = array();
    
      $destination = drupal_get_destination();
    
      //define where to display the different nodeprofile types (column 1 or 2 on the page)
      $types_col1 = array(
        'languageform',
        'uprofile_business',
      );

      $types_col2 = array(
        'uprofile_contact',
        'uprofile_personal'
      );

      //Get the node id of the parentnode ('usernode')
      if (arg(0) == 'usernode'){
        $nid = $usernode->nid;
      }
      if (arg(0)=='node' && is_numeric(arg(1))) {
        $nid = arg(1);
      }
      $node = node_load($nid);

      // Load all children of usernode ( = nodeprofiles ), sorted by content type. 
      $children = nodefamily_relation_load_by_type($nid);
    
      //get nodeprofiles if they exist, else notify user and show "add <node type>" link
      foreach($types_col1 as $type){
        if(isset($children[$type])){
          $output_col1[$type] = array(
            '#type' => 'nodeprofile_display_teaser',
            '#title' => node_get_types('name', $type),
            '#tabs' => array('edit'),
            '#uid' => $node->uid,
            '#content_type' => $type,
            '#weight' => 0,
            '#suffix' => '<br />',
          ); 
        } elseif ($user->uid == $node->uid || user_access('administer content')) {
          //Check if the current user the profile owner or does he has administration privileges ?
          $typename = node_get_types('name', $type);
          //Case 1: It's the profilenode of the current user
          if ($user->uid == $node->uid){
            $profiles_not_set1 .= '<div class="nodeprofile_not_set">' . t('Sie haben noch kein @typename erstellt.', array('@typename' => $typename)) . '<br />';
            //If no nodeprofile of type $type exists, then do this:
            $add_profile  = l(t($typename . ' erstellen'), 'user/' . $user->uid . '/edit/' . $type, array(), $destination, NULL, FALSE, TRUE);
            $profiles_not_set1 .= $add_profile .'</div>';
          } elseif (user_access('administer content')){
          // Case 2: User has administration privileges; so let him create this node.
            $profiles_not_set1 .= '<div class="nodeprofile_not_set">' . t('Der Nutzer hat noch kein @typename erstellt.', array('@typename' => $typename)) . '<br />';
            //If no nodeprofile of type $type exists, then do this:
            $add_profile  = l(t($typename . ' erstellen'), 'user/' . $node->uid . '/edit/' . $type, array(), $destination, NULL, FALSE, TRUE);
            $profiles_not_set1 .= $add_profile .'</div>';

          }
        }
      }

      foreach($types_col2 as $type){
        if(isset($children[$type])){
          $output_col2[$type] = array(
            '#type' => 'nodeprofile_display_teaser',
            '#title' => node_get_types('name', $type),
            '#tabs' => array('edit'),
            '#uid' => $node->uid,
            '#content_type' => $type,
            '#weight' => 0,
            '#suffix' => '<br />',
          ); 
        } elseif ($user->uid == $node->uid || user_access('administer content')) {
        //Check if the current user the profile owner or does he has administration privileges ?
          $typename = node_get_types('name', $type);
          //Case 1: It's the profilenode of the current user
          if ($user->uid == $node->uid){
            $profiles_not_set2 .= '<div class="nodeprofile_not_set">' . t('Sie haben noch kein @typename erstellt.', array('@typename' => $typename)) . '<br />';
            //If no nodeprofile of type $type exists, then do this:
            $add_profile  = l(t($typename . ' erstellen'), 'user/' . $user->uid . '/edit/' . $type, array(), $destination, NULL, FALSE, TRUE);
            $profiles_not_set2 .= $add_profile .'</div>';
          } elseif (user_access('administer content')){
          // Case 2: User has administration privileges; so let him create this node.
            $profiles_not_set2 .= '<div class="nodeprofile_not_set">' . t('Der Nutzer hat noch kein @typename erstellt.', array('@typename' => $typename)) . '<br />';
            //If no nodeprofile of type $type exists, then do this:
            $add_profile  = l(t($typename . ' erstellen'), 'user/' . $node->uid . '/edit/' . $type, array(), $destination, NULL, FALSE, TRUE);
            $profiles_not_set2 .= $add_profile .'</div>';
          
          }
        }
      }
    
      $profiles_set1 = drupal_render($output_col1);       
      $profiles_set2 = drupal_render($output_col2); 
      $vars['nodeprofiles_col1'] = $profiles_set1 . $profiles_not_set1;
      $vars['nodeprofiles_col2'] = $profiles_set2 . $profiles_not_set2;
    }
...

If nobody else should have the same kind of problem, then please don't waste time with this. I will use the nodefamiliy instead.
Anyway, thanks for your help (and your module!).