--- trunk/OOPSE-3.0/src/brains/SnapshotManager.hpp	2005/02/13 06:57:48	2002
+++ trunk/OOPSE-3.0/src/brains/SnapshotManager.hpp	2005/02/13 08:05:33	2006
@@ -69,7 +69,7 @@ namespace oopse{
                 delete previousSnapshot_;
             }
             
-            virtual bool advance() {}
+            virtual bool advance() { return true; }
 
             virtual Snapshot* getSnapshot(int id) = 0;