diff --git a/src/actions.c b/src/actions.c
index 12798dfa..3070d264 100644
--- a/src/actions.c
+++ b/src/actions.c
@@ -750,6 +750,7 @@ int set_inst_flags(xInstance *inst)
   const char *ptr;
   inst->flags &= IGNORE_INST; /* do not clear IGNORE_INST bit, used in draw_symbol() */
   my_strdup2(_ALLOC_ID_, &inst->instname, get_tok_value(inst->prop_ptr, "name", 0));
+  dbg(1, "set_inst_flags(): instname=%s\n", inst->instname);
   if(inst->ptr >=0) {
     char *type = xctx->sym[inst->ptr].type;
     int cond= type && IS_LABEL_SH_OR_PIN(type);
diff --git a/src/store.c b/src/store.c
index bce25259..80a17c02 100644
--- a/src/store.c
+++ b/src/store.c
@@ -68,11 +68,16 @@ void check_inst_storage(void)
 {
  if(xctx->instances >= xctx->maxi)
  {
+  int i, old = xctx->maxi;
+  
   xctx->maxi=(1 + xctx->instances / ELEMINST) * ELEMINST;
   my_realloc(_ALLOC_ID_, &xctx->inst, sizeof(xInstance)*xctx->maxi);
   #ifdef ZERO_REALLOC
   memset(xctx->inst + xctx->instances, 0, sizeof(xInstance) * (xctx->maxi - xctx->instances));
   #endif
+  /* clear all flag bits (to avoid random data in bit 8, that can not be cleraed 
+   * by set_inst_flags() */
+  for(i = old; i < xctx->maxi; i++) xctx->inst[i].flags = 0;
  }
 }