diff --git a/src/modelchecker.c b/src/modelchecker.c
index 4fc3760..730e238 100644
--- a/src/modelchecker.c
+++ b/src/modelchecker.c
@@ -105,7 +105,6 @@ traverse (const System sys)
 int
 executeStep (const System sys, const int run)
 {
-  unsigned long int parentBuffer;
   Roledef runPoint;
   runPoint = runPointerGet (sys, run);
 #ifdef DEBUG
diff --git a/src/output.c b/src/output.c
index 6cfda8e..af513f8 100644
--- a/src/output.c
+++ b/src/output.c
@@ -481,6 +481,9 @@ attackDisplayAscii (System sys)
 void
 attackDisplay (System sys)
 {
+  if (!sys->report)
+      return;
+
   if (sys->latex)
     {
       attackDisplayLatex (sys);
@@ -575,7 +578,7 @@ void graphPath (const System sys, const char* params)
   i = 0;
   while (i < sys->step)
     {
-      printf ("\tn%i [%s]\n", sys->traceNode[i], params);
+      printf ("\tn%li [%s];\n", sys->traceNode[i], params);
       i++;
     }
 }
diff --git a/src/runs.c b/src/runs.c
index ab27f84..e4a8aa3 100644
--- a/src/runs.c
+++ b/src/runs.c
@@ -109,7 +109,6 @@ systemReset (const System sys)
   /* some initial counters */
   sys->statesLow = 0;		// number of explored states
   sys->statesHigh = 0;		// this is not as ridiculous as it might seem
-  sys->parentState = 0;
   sys->explore = 1;		// do explore the space
   sys->claims = 0;		// number of claims encountered
   sys->failed = 0;		// number of failed claims
diff --git a/src/runs.h b/src/runs.h
index 6769eb3..b02b339 100644
--- a/src/runs.h
+++ b/src/runs.h
@@ -229,8 +229,6 @@ struct system
   unsigned long int claims;	//!< Number of claims encountered.
   unsigned long int failed;	//!< Number of claims failed.
 
-  unsigned long int parentState; //!< Parent state number
-
   /* matching */
   int match;			//!< Matching type.
   int clp;			//!< Do we use clp?
@@ -250,7 +248,7 @@ struct system
   Roledef *traceEvent;		//!< Trace roledefs: MaxRuns * maxRoledef
   int *traceRun;		//!< Trace run ids: MaxRuns * maxRoledef
   Knowledge *traceKnow;		//!< Trace intruder knowledge: Maxruns * maxRoledef
-  unsigned long int *traceNode;	//!< Trace node traversal
+  unsigned long int *traceNode;	//!< Trace node traversal: Maxruns * maxRoledef
 
   /* POR reduction assistance */
   int PORphase;			//!< -1: init (all sends), 0...: recurse reads