Index: Application/Bootstrap/BootstrapAbstract.php
===================================================================
--- Application/Bootstrap/BootstrapAbstract.php	(revision 19313)
+++ Application/Bootstrap/BootstrapAbstract.php	(working copy)
@@ -351,7 +351,7 @@
                 }
             }
 
-            if (class_exists($plugin) {
+            if (class_exists($plugin, false)) {
                 $spec = (array) $spec;
                 $spec['bootstrap'] = $this;
                 $instance = new $plugin($spec);