Index: ../osprey/be/opt/opt_cfg.cxx
===================================================================
--- ../osprey/be/opt/opt_cfg.cxx	(revision 3648)
+++ ../osprey/be/opt/opt_cfg.cxx	(working copy)
@@ -5231,6 +5231,12 @@
 {
   //  loop->Header() must be defined
 
+  loop->Set_start(NULL);
+  loop->Set_end(NULL);
+  loop->Set_body(NULL);
+  loop->Set_step(NULL);
+  loop->Set_merge(NULL);
+
   loop->Set_loopback(NULL);
   loop->Set_preheader(NULL);
   loop->Set_tail(NULL);