diff -ur conditional_fields.old/conditional_fields.module conditional_fields/conditional_fields.module
--- conditional_fields.old/conditional_fields.module	2011-02-25 07:29:16.000000000 -0600
+++ conditional_fields/conditional_fields.module	2011-02-25 07:30:45.000000000 -0600
@@ -995,6 +995,10 @@
   elseif (isset($field[0]['nid'])) {
     $value = $field[0]['nid'];
   }
+  // User reference
+  elseif (isset($field[0]['uid'])) {
+    $value = $field[0]['uid'];
+  }
 
   if (!count($value) || (is_string($value) && drupal_strlen(trim($value)) == 0)) {
     return TRUE;