diff -r 79b710322d98 openide.util.lookup/src/org/openide/util/lookup/ProxyLookup.java
--- a/openide.util.lookup/src/org/openide/util/lookup/ProxyLookup.java	Wed Mar 28 09:58:51 2012 +0200
+++ b/openide.util.lookup/src/org/openide/util/lookup/ProxyLookup.java	Wed Mar 28 15:15:11 2012 +0200
@@ -534,15 +534,15 @@
         private java.util.Collection computeResult(int indexToCache, boolean callBeforeLookup) {
             Lookup.Result[] arr = myBeforeLookup(callBeforeLookup, false);
             // use caches, if they exist
-            synchronized (proxy()) {
-                Collection[] cc = getCache();
-                if (cc != null && cc != R.NO_CACHE) {
-                    Collection r = cc[indexToCache];
-                    if (r != null) {
-                        return r;
-                    }
-                }
-            }
+//            synchronized (proxy()) {
+//                Collection[] cc = getCache();
+//                if (cc != null && cc != R.NO_CACHE) {
+//                    Collection r = cc[indexToCache];
+//                    if (r != null) {
+//                        return r;
+//                    }
+//                }
+//            }
             if (indexToCache == 1) {
                 return new LazySet(this, indexToCache, callBeforeLookup, arr);
             }