diff -Naur old/taxonomy_delegate/taxonomy_delegate.module new/taxonomy_delegate/taxonomy_delegate.module
--- taxonomy_delegate/taxonomy_delegate.module	2010-04-14 14:17:09.816568538 +1000
+++ taxonomy_delegate/taxonomy_delegate.module	2010-04-14 14:24:45.192557426 +1000
@@ -26,6 +26,20 @@
 }
 
 /**
+ * Function called to determine whether the category_admin should be display.or not.
+ * It's said to be "ugly" to check this in the 'access callback', but the nice solution
+ * do not work at all (taxonomy_delegate_load function is never called).
+ * For more information, see: http://drupal.org/node/291665
+ */
+function check_count() {
+  $any = count(_taxonomy_delegate_my_vocabularies());
+  if ($any) {
+    return TRUE;
+  }
+  return FALSE;
+}
+
+/**
  * Implementation of hook_menu().
  */
 function taxonomy_delegate_menu() {
@@ -41,16 +55,14 @@
     'type' => MENU_LOCAL_TASK,
     );
 
-    // User admin callback.
-  $any = count(_taxonomy_delegate_my_vocabularies());
-  if ($any) {
-    $items['category_admin'] = array(
-      'title' => '@name',
-      'title arguments' => array('@name' => variable_get('taxonomy_delegate_menu', t('Administer My Categories'))),
-      'page callback' => 'taxonomy_delegate_mycategories',
-      'access arguments' => array('access content'),
-      );
-  }
+  // User admin callback.
+  $items['category_admin'] = array(
+    'title' => '@name',
+    'title arguments' => array('@name' => variable_get('taxonomy_delegate_menu', t('Administer My Categories'))),
+    'page callback' => 'taxonomy_delegate_mycategories',
+    'access callback' => 'check_count',
+    'access arguments' => array('access content'),
+    );
 
   // Admin settings.
   $items['admin/settings/taxonomy_delegate'] = array(