diff -ruNB a/blocks/course_overview/renderer.php b/blocks/course_overview/renderer.php
--- a/blocks/course_overview/renderer.php       2013-06-20 15:22:14.000000000 -0500
+++ b/blocks/course_overview/renderer.php       2013-06-20 15:22:55.000000000 -0500
@@ -103,7 +103,7 @@
 
             // No need to pass title through s() here as it will be done automatically by html_writer.
             $attributes = array('title' => $course->fullname);
-            if (empty($course->visible)) {
+            if (empty($course->visible) && ($course->id > 0)) {
                 $attributes['class'] = 'dimmed';
             }
             if ($course->id > 0) {