diff -r 5e1f648e021e javafx-ui-common/src/com/sun/javafx/WeakReferenceMap.java
--- a/javafx-ui-common/src/com/sun/javafx/WeakReferenceMap.java	Wed May 26 11:03:23 2010 -0700
+++ b/javafx-ui-common/src/com/sun/javafx/WeakReferenceMap.java	Wed Jun 02 14:22:22 2010 -0700
@@ -19,7 +19,7 @@
 
     @SuppressWarnings("unchecked")
     public Object put(Object key, Object obj) {
-        cleanup();
+        remove(key);
         Entry entry = new Entry();
         entry.weakKey = new WeakReference(key);
         entry.value = obj;
@@ -97,4 +97,4 @@
         WeakReference weakKey;
         Object value;
     }
-}
\ No newline at end of file
+}