diff --git a/core/src/main/java/org/piccolo2d/activities/PActivityScheduler.java b/core/src/main/java/org/piccolo2d/activities/PActivityScheduler.java
index 6ae7f9e..3e6358a 100644
--- a/core/src/main/java/org/piccolo2d/activities/PActivityScheduler.java
+++ b/core/src/main/java/org/piccolo2d/activities/PActivityScheduler.java
@@ -170,7 +170,6 @@
     public void processActivities(final long currentTime) {
         final int size = activities.size();
         if (size > 0) {
-            processingActivities.clear();
             processingActivities.addAll(activities);
             for (int i = size - 1; i >= 0; i--) {
                 final PActivity each = (PActivity) processingActivities.get(i);
diff --git a/examples/src/main/java/org/piccolo2d/examples/ActivityMemoryLeakBugExample.java b/examples/src/main/java/org/piccolo2d/examples/ActivityMemoryLeakBugExample.java
index c5fa500..f621e08 100644
--- a/examples/src/main/java/org/piccolo2d/examples/ActivityMemoryLeakBugExample.java
+++ b/examples/src/main/java/org/piccolo2d/examples/ActivityMemoryLeakBugExample.java
@@ -91,14 +91,17 @@
                     // empty
                 }
 
-                PActivity a = new PActivity(-1) {
-                        /** {@inheritDoc} */
-                        protected void activityStep(final long elapsedTime) {
-                            System.out.println("cleanup activity");
-                            terminate();
+                SwingUtilities.invokeLater(new Runnable() {
+                        public void run() {
+                            PActivity a = new PActivity(-1) {
+                                    protected void activityStep(final long elapsedTime) {
+                                        System.out.println("cleanup activity");
+                                        terminate();
+                                    }
+                                };
+                            layer.getRoot().addActivity(a);
                         }
-                    };
-                layer.getRoot().addActivity(a);
+                    });
             }
         }.start();
     }