--- loncom/interface/lonpreferences.pm	2009/12/07 00:04:10	1.125.8.4
+++ loncom/interface/lonpreferences.pm	2009/12/07 01:41:31	1.125.8.5
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Preferences
 #
-# $Id: lonpreferences.pm,v 1.125.8.4 2009/12/07 00:04:10 raeburn Exp $
+# $Id: lonpreferences.pm,v 1.125.8.5 2009/12/07 01:41:31 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2123,9 +2123,11 @@ sub handler {
 
 sub toggle_debug {
     if (&can_toggle_debug()) {
-        &Apache::lonnet::delenv('user.debug');
-    } else {
-        &Apache::lonnet::appenv({'user.debug' => 1});
+        if ($env{'user.debug'}) {
+            &Apache::lonnet::delenv('user.debug');
+        } else {
+            &Apache::lonnet::appenv({'user.debug' => 1});
+        }
     }
 }