diff -Naur WebCalendar-1.2.3.orig/includes/classes/WebCalendar.class WebCalendar-1.2.3.new/includes/classes/WebCalendar.class
--- WebCalendar-1.2.3.orig/includes/classes/WebCalendar.class	2011-04-14 17:11:22.307271821 +0200
+++ WebCalendar-1.2.3.new/includes/classes/WebCalendar.class	2011-04-14 19:20:58.351077771 +0200
@@ -153,6 +153,7 @@
     load_global_settings ();
 
     $this->setLanguage ();
+    $user = getValue ( 'user', '[A-Za-z0-9_\.=@,\-]*', true );
 
     if ( empty ( $ovrd ) )
       load_user_preferences ();
@@ -166,7 +167,6 @@
     $id = getValue ( 'id', '[0-9]+', true );
     $minute = getValue ( 'minute', '[0-9]+' );
     $month = getValue ( 'month', '[0-9]+' );
-    $user = getValue ( 'user', '[A-Za-z0-9_\.=@,\-]*', true );
     $year = getValue ( 'year', '[0-9]+' );
     if ( empty ( $PUBLIC_ACCESS ) )
       $PUBLIC_ACCESS = 'N';
@@ -227,7 +227,8 @@
 
       if ( ! empty ( $user ) ) {
         $u_url = 'user=' . $user . '&';
-        user_load_variables ( $user, 'user_' );
+        if (!user_load_variables ( $user, 'user_' ))
+          nonuser_load_variables($user, 'user_');
         if ( $user == '__public__' )
           $user_fullname = translate ( $PUBLIC_ACCESS_FULLNAME );
       } else {
diff -Naur WebCalendar-1.2.3.orig/includes/functions.php WebCalendar-1.2.3.new/includes/functions.php
--- WebCalendar-1.2.3.orig/includes/functions.php	2011-04-14 17:11:22.271275172 +0200
+++ WebCalendar-1.2.3.new/includes/functions.php	2011-04-14 19:22:25.296955185 +0200
@@ -4275,6 +4275,7 @@
       $GLOBALS[$prefix . 'login'] = $row[0];
       $GLOBALS[$prefix . 'lastname'] = $row[1];
       $GLOBALS[$prefix . 'firstname'] = $row[2];
+      $GLOBALS[$prefix . 'fullname'] = trim($raw[1] . ' ' . $row[2]);
       $GLOBALS[$prefix . 'admin'] = $row[3];
       $GLOBALS[$prefix . 'is_public'] = $row[4];
       $GLOBALS[$prefix . 'url'] = $row[5];
@@ -5860,7 +5861,8 @@
   if ( $rows ) {
     for ( $i = 0, $cnt = count ( $rows ); $i < $cnt; $i++ ) {
       $row = $rows[$i];
-      user_load_variables ( $row[0], 'bosstemp_' );
+      if (!user_load_variables ( $row[0], 'bosstemp_' ))
+        nonuser_load_variables($row[0], 'bosstemp_');
       $ret[$count++] = array (
         'cal_login' => $row[0],
         'cal_fullname' => $bosstemp_fullname
diff -Naur WebCalendar-1.2.3.orig/includes/menu/index.php WebCalendar-1.2.3.new/includes/menu/index.php
--- WebCalendar-1.2.3.orig/includes/menu/index.php	2011-04-14 17:11:22.171284485 +0200
+++ WebCalendar-1.2.3.new/includes/menu/index.php	2011-04-14 19:33:10.341676201 +0200
@@ -211,12 +211,17 @@
   }
   $groups = '';
   $grouplistcnt = count ( $grouplist );
+  $gdone = array();
   for ( $i = 0; $i < $grouplistcnt; $i++ ) {
     $l = $grouplist[$i]['cal_login'];
     $f = $grouplist[$i]['cal_fullname'];
     // Don't display current $user in group list.
     if ( ! empty ( $user ) && $user == $l )
       continue;
+    // Do not show duplicate entries.
+    if (isset($gdone[$l]))
+      continue;
+    $gdone[$l] = true;
     /*
 Use the preferred view if it is day/month/week/year.php. Try not to use a
 user-created view because it might not display the proper user's events.