Again separate out EngineException from any Throwable.

src/altk/comm/engine/Broadcast.java

@@ -306,6 +306,10 @@ public abstract class Broadcast
                     {
                         terminate(BroadcastState.ABORTED, e.getMessage());
                     }
+                    catch (Throwable t)
+                    {
+                        terminate(BroadcastState.ABORTED, t + ": " + t.getMessage());
+                    }
                 }
             }            
         }