diff --git a/C/tracer.c b/C/tracer.c
index 62cc99aaf..d5d6044b9 100644
--- a/C/tracer.c
+++ b/C/tracer.c
@@ -141,9 +141,13 @@ low_level_trace(yap_low_level_port port, PredEntry *pred, CELL *args)
   Int arity;
   /*  extern int gc_calls; */
 
+
+  // if (!worker_id) return;
   LOCK(Yap_heap_regs->low_level_trace_lock);
   sc = Yap_heap_regs;
   vsc_count++;
+  //if (vsc_count == 54) jmp_deb(1);
+  //  fprintf(stderr,"B=%p ", B);
 #ifdef THREADS
   LOCAL_ThreadHandle.thread_inst_count++;
 #endif  
diff --git a/os/pl-read.c b/os/pl-read.c
index 6e13be185..4ee3dd5d2 100644
--- a/os/pl-read.c
+++ b/os/pl-read.c
@@ -438,7 +438,6 @@ parse_quasi_quotations(ReadData _PL_rd ARG_LD)
 { if ( _PL_rd->qq_tail )
   { term_t av;
     int rc;
-      printf("h5\n");
 
     if ( !PL_unify_nil(_PL_rd->qq_tail) )
       return FALSE;