diff --git a/wysiwyg.admin.inc b/wysiwyg.admin.inc
index 8f12bf0..bafb057 100644
--- a/wysiwyg.admin.inc
+++ b/wysiwyg.admin.inc
@@ -459,9 +459,17 @@ function wysiwyg_profile_overview($form, &$form_state) {
     // Only display editor selection for associated input formats to avoid
     // confusion about disabled selection.
     if (isset($profiles[$id]) && !empty($profiles[$id]->editor)) {
+      $editor_name = $profiles[$id]->editor;
+      $installed = !empty($editors[$editor_name]['installed']);
       $form['formats'][$id]['editor'] = array(
-        '#markup' => $options[$profiles[$id]->editor],
+        '#wysiwyg-editor-name' => $editor_name,
       );
+      if ($installed) {
+        $form['formats'][$id]['editor']['#markup'] = $options[$editor_name];
+      }
+      else {
+        drupal_set_message(t('A @library profile has been assigned to the @format format, but the @library library was not detected. Either reinstall the @library library or delete the editor profile before proceeding.', array('@library' => $editors[$editor_name]['title'], '@format' => $format->name)), 'warning');
+      }
     }
     else {
       $form['formats'][$id]['editor'] = array(
@@ -496,17 +504,28 @@ function theme_wysiwyg_profile_overview($variables) {
   if (!isset($form['formats'])) {
     return;
   }
+  $editors = wysiwyg_get_all_editors();
   $output = '';
   $header = array(t('Text format'), t('Editor'), array('data' => t('Operations'), 'colspan' => 2));
   $rows = array();
   foreach (element_children($form['formats']) as $item) {
     $format = &$form['formats'][$item];
-    $rows[] = array(
-      drupal_render($format['name']),
-      drupal_render($format['editor']),
-      isset($format['edit']) ? drupal_render($format['edit']) : '',
-      isset($format['delete']) ? drupal_render($format['delete']) : '',
+    $row = array(
+      'data' => array(
+        drupal_render($format['name']),
+        drupal_render($format['editor']),
+        isset($format['edit']) ? drupal_render($format['edit']) : '',
+        isset($format['delete']) ? drupal_render($format['delete']) : '',
+      ),
     );
+    if (empty($row['data'][1])) {
+      $row['data'][1] = array(
+        'data' => t('Missing library: @library', array('@library' => $editors[$format['editor']['#wysiwyg-editor-name']]['title'])),
+        'class' => 'error',
+      );
+      $row['class'] = array('error');
+    }
+    $rows[] = $row;
   }
   $form['formats']['table']['#markup'] = theme('table', array('header' => $header, 'rows' => $rows));
   $output .= drupal_render_children($form);