--- branches/development/src/brains/SimSnapshotManager.cpp	2011/11/22 20:38:56	1665
+++ branches/development/src/brains/SimSnapshotManager.cpp	2012/07/03 18:32:27	1764
@@ -67,6 +67,7 @@ namespace OpenMD {
 
     *previousSnapshot_ = *currentSnapshot_;
     currentSnapshot_->setID(currentSnapshot_->getID() + 1);    
+    currentSnapshot_->clearDerivedProperties();
     return true;
   }