diff --git a/preferences.xml b/preferences.xml
index eb4cd2e50..adb0487e9 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -555,6 +555,7 @@ Started September 2000 by David Megginson, david@megginson.com
118500000
true
+ false
Models/Geometry/glider.ac