- Some POR optimizations in roleInstance were disabled for Arachne.

src/system.c

@@ -661,12 +661,15 @@ roleInstance (const System sys, const Protocol protocol, const Role role,
   /* erase any substitutions in the role definition, as they are now copied */
   termlistSubstReset (role->variables);
 
+  if (sys->engine == POR_ENGINE)
+    {
       /* Determine symmetric run */
       runs[rid].prevSymmRun = staticRunSymmetry (sys, rid);	// symmetry reduction static analysis
 
       /* Determine first read with variables besides agents */
       runs[rid].firstNonAgentRead = firstNonAgentRead (sys, rid);	// symmetry reduction type II
     }
+}
 
 
 //! Destroy roleInstance