diff --git a/SCinter.c b/SCinter.c
index f640258e..dcec3d12 100644
--- a/SCinter.c
+++ b/SCinter.c
@@ -450,12 +450,11 @@ void DeleteInterp(SicsInterp * self)
   if (tail) {
     pCurrent = tail;
     while (pCurrent) {
-      /* the line below fixes problems with kill functions 
-       * traversing the command list
-       */
-      pCurrent->pNext = NULL;
+      pCurrent->pNext = NULL; /* inhibit access to killed commands by FindCommandData */
       if (pCurrent->KFunc) {
-        pCurrent->KFunc(pCurrent->pData);
+        void *data = pCurrent->pData;
+        pCurrent->pData = NULL; /* make data unreachable by FindCommandData before killing */
+        pCurrent->KFunc(data);
       }
       if (pCurrent->pName) {
         /* printf("Deleting %s\n",pCurrent->pName); */
diff --git a/devser.c b/devser.c
index 4cbf4bd6..b76e41b0 100644
--- a/devser.c
+++ b/devser.c
@@ -27,7 +27,6 @@ struct DevSer {
   DevAction *toKill;            /* list of actions to be killed */
   SchedHeader *headers;
   int steps;
-  int stopTask;
 };
 
 static char *devPrio[NumberOfPRIO] = {
@@ -58,23 +57,14 @@ static void DevFreeActionList(DevAction * actions)
   while (actions != NULL) {
     victim = actions;
     actions = victim->next;
+    assert(victim->data != NULL);
     if (victim->kill != NULL)
       victim->kill(victim->data);
+    victim->data=NULL;
     free(victim);
   }
 }
 
-static void DevKillTask(void *ds)
-{
-  DevSer *devser = ds;
-
-  if (devser->stopTask) {
-    free(devser);
-  } else {
-    devser->stopTask = 1;
-  }
-}
-
 DevAction *DevNextAction(DevSer * devser)
 {
   DevPrio prio;
@@ -130,9 +120,6 @@ int DevQueueTask(void *ds)
   
   if (devser->steps == 0)
     return 1;
-  if (devser->stopTask) {
-    return 0;
-  }
   
   /* deferred deallocation of removed actions */
   DevFreeActionList(devser->toKill);
@@ -188,10 +175,9 @@ DevSer *DevMake(SConnection * con, int argc, char *argv[])
   devser->killCurrent = 0;
   devser->actions = NULL;
   devser->headers = NULL;
-  devser->stopTask = 0;
   devser->toKill = NULL;
   devser->steps = -1;           /* no debugging by default */
-  TaskRegister(pServ->pTasker, DevQueueTask, NULL, DevKillTask, devser, 0);
+  TaskRegister(pServ->pTasker, DevQueueTask, NULL, NULL, devser, 0);
   return devser;
 }
 
@@ -235,11 +221,8 @@ void DevKill(DevSer * devser)
     devser->killCurrent = 0;
     free(devser->current);
   }
-  if (devser->stopTask) {
-    free(devser);
-  } else {
-    devser->stopTask = 1;
-  }
+  TaskRemove(pServ->pTasker, DevQueueTask, devser);
+  free(devser);
 }
 
 void DevDisconnect(DevSer * devser)
diff --git a/hipadaba.c b/hipadaba.c
index e9878872..786940b3 100644
--- a/hipadaba.c
+++ b/hipadaba.c
@@ -113,7 +113,7 @@ void RecurseCallbackChains(pHdb node, pHdbMessage message)
 /*-----------------------------------------------------------------------*/
 void DeleteNodeData(pHdb node)
 {
-  pHdb tmp = NULL;
+  pHdb tmp = NULL, next = NULL;
 
   if (node == NULL) {
     return;
@@ -132,8 +132,9 @@ void DeleteNodeData(pHdb node)
 
   while (node->child != NULL) {
     tmp = node->child;
-    node->child = node->child->next;
+    next = node->child->next;
     DeleteNodeData(tmp);
+    node->child = next;
   }
   free(node);
 }
diff --git a/obdes.c b/obdes.c
index 63f48e06..ce0b9bb6 100644
--- a/obdes.c
+++ b/obdes.c
@@ -84,7 +84,7 @@ void DeleteDescriptor(pObjectDescriptor self)
   if (self->pKeys)
     IFDeleteOptions(self->pKeys);
   /*
-   * delate a parameter node only when not linked elsewhere
+   * delete a parameter node only when not linked elsewhere
    */
   if (self->parNode != NULL) {
     if (self->parNode->mama == NULL) {
diff --git a/scriptcontext.c b/scriptcontext.c
index ede6c54c..4c1641f0 100644
--- a/scriptcontext.c
+++ b/scriptcontext.c
@@ -43,6 +43,7 @@ typedef struct SctData {
   SctController *controller;
   SConnection *conCtx;
   int answered;
+  int inMacro;
   Hdb *node;
 } SctData;
 
@@ -151,7 +152,8 @@ int SctCommand(SConnection * con, SicsInterp * sics, void *object,
   Hdb *cNode = NULL;
   hdbValue v;
   double dtime;
-
+  int iMacro;
+  
   assert(sct == object);
   if (sct->nodes != NULL) {
     node = sct->nodes->node;
@@ -188,11 +190,14 @@ int SctCommand(SConnection * con, SicsInterp * sics, void *object,
    * print
    */
   if (strcmp(argv[1], "print") == 0) {
+    iMacro = con->iMacro;
     if (queueData != NULL) {
       queueData->answered = 1;
+      con->iMacro = queueData->inMacro; /* take macro flag stored at set callback */
     }
     Arg2Text(argc - 2, argv + 2, value, sizeof value);
-    SCWrite(con, value, eLog);
+    SCWrite(con, value, eWarning);
+    con->iMacro = iMacro;
     return 1;
   }
 
@@ -205,7 +210,7 @@ int SctCommand(SConnection * con, SicsInterp * sics, void *object,
   }
 
   /*
-   * time stamping (obsolete ? -> see SctActionHandler: timeKey, timeVal)
+   * time stamping
    */
   if (strcmp(argv[1], "utime") == 0) {
     if (argc < 3) {
@@ -334,13 +339,13 @@ static char *SctActionHandler(void *actionData, char *lastReply,
       commError = 0;
     }
     script = strdup(script);
-    if (!SctCallInContext(con, script, node, data->controller, &result)) {
+    if (!SctCallInContext(con, script, node, controller, &result)) {
       snprintf(eprop, sizeof eprop, "error_during_%s", data->name);
       if (strncmp(result, "ERROR: ", 7) == 0) {
         result += 7;
       }
       emsg = GetHdbProp(node, eprop);
-      if (emsg == NULL) {
+      if (emsg == NULL || con != controller->conn) {
         GetHdbPath(node, path, sizeof path);
         SCPrintf(con, eError,
                  "ERROR: action <%s> in {%s} node %s:\nERROR:   %s",
@@ -364,6 +369,7 @@ static char *SctActionHandler(void *actionData, char *lastReply,
       snprintf(msg, sizeof msg, "%dx {%s} %s", cnt, origScript, result);
       SetHdbProperty(node, eprop, msg);
       send = NULL;
+      free(script);
       goto finish;
     }
     state = result;
@@ -384,6 +390,7 @@ static char *SctActionHandler(void *actionData, char *lastReply,
       snprintf(timeVal, sizeof timeVal, "%.3f", DoubleTime());
       SetHdbProperty(node, timeKey, timeVal);
       send = NULL;
+      free(script);
       goto finish;
     }
     SetProp(node, controller->node, "state", state);
@@ -568,13 +575,15 @@ static hdbCallbackReturn SctActionCallback(Hdb * node, void *userData,
 
     if (data->conCtx != NULL) {
       GetHdbPath(node, path, sizeof path);
-      SCPrintf(data->conCtx, eLog,
+      SCPrintf(data->conCtx, eWarning,
                "%s target changed to %s before completion", path,
                GetCharArray(text));
+      SCDeleteConnection(data->conCtx);
     }
     DeleteDynString(text);
     data->conCtx = SCCopyConnection(con);
     data->answered = 0;
+    data->inMacro = con->iMacro;
     DevQueue(data->controller->devser, data, prio,
              SctWriteHandler, SctMatch, NULL);
     /* no kill function in DevQueue: data is owned by the node (callback list) */
@@ -585,13 +594,11 @@ static hdbCallbackReturn SctActionCallback(Hdb * node, void *userData,
   if (mm != NULL) {
     if (queueData != NULL && queueData->conCtx != NULL && !data->answered) {
       /* update called from a write action */
-      /*
       data->answered = 1;
       GetHdbPath(node, path, sizeof path);
       text = formatValue(*(mm->v), node);
       SCPrintf(queueData->conCtx, eWarning, "OK: %s set to: %s", path, GetCharArray(text));
       DeleteDynString(text);
-      */
     }
     return hdbContinue;
   }
@@ -1050,9 +1057,14 @@ static hdbCallbackReturn SctDebugCallback(Hdb * node, void *userData,
   return hdbContinue;
 }
 
-static int SctDeferredFree(void *data)
+static void SctDeferredFree(void *data)
 {
   free(data);
+  return;
+}
+
+static int SctDeferredTask(void *data)
+{
   return 0;
 }
 
@@ -1069,8 +1081,8 @@ static void SctKillController(void *c)
   DevKill(controller->devser);
   controller->devser = NULL;
   if (pServ->pTasker) {
-    TaskRegister(pServ->pTasker, SctDeferredFree, NULL, NULL, controller,
-                 0);
+    TaskRegister(pServ->pTasker, SctDeferredTask, NULL, SctDeferredFree,
+                 controller, 0);
   } else {
     free(controller);
   }
@@ -1124,6 +1136,8 @@ static int SctMakeController(SConnection * con, SicsInterp * sics,
   if (!controller->devser)
     return 0;
 
+  SetHdbProperty(controller->node, "controllerName", objName);
+
   AddCommand(pServ->pSics, objName, InterInvokeSICSOBJ, KillSICSOBJ, ccmd);
   RegisterSICSOBJKillCmd(ccmd, objName);
   SetDescriptorKey(ccmd->pDes, "creationCommand", "0");
diff --git a/sicsobj.c b/sicsobj.c
index 6878202f..6a3a5a4a 100644
--- a/sicsobj.c
+++ b/sicsobj.c
@@ -84,11 +84,13 @@ static void KillSICSOBJfromNode(void *userData)
   NameClass *nameClass = userData;
   SICSOBJ *sicsobj;
   
-  sicsobj = FindCommandData(pServ->pSics, nameClass->name, nameClass->class);
-  if (sicsobj) {
-    sicsobj->objectNode = NULL; /* do not call RemoveHdbNodeFromParent in KillSICSOBJ */
-    sicsobj->pDes->parNode = NULL; /* do not free the node twice in KillSICSOBJ/DeleteDescriptor */
-    RemoveCommand(pServ->pSics, nameClass->name);
+  if (pServ->pSics != NULL) {
+    sicsobj = FindCommandData(pServ->pSics, nameClass->name, nameClass->class);
+    if (sicsobj) {
+      sicsobj->objectNode = NULL; /* do not call RemoveHdbNodeFromParent in KillSICSOBJ */
+      sicsobj->pDes->parNode = NULL; /* do not free the node twice in KillSICSOBJ/DeleteDescriptor */
+      RemoveCommand(pServ->pSics, nameClass->name);
+    }
   }
   free(nameClass->name);
   free(nameClass->class);
@@ -159,7 +161,7 @@ void KillSICSOBJ(void *data)
   if (self->KillPrivate != NULL && self->pPrivate != NULL) {
     self->KillPrivate(self->pPrivate);
   }
-  if (self->objectNode != NULL) {
+  if (self->objectNode != NULL && pServ->pTasker != NULL) { /* not on rundown */
     RemoveHdbNodeFromParent(self->objectNode, pServ->dummyCon);
   }
   if (self->pDes != NULL) {
diff --git a/task.c b/task.c
index a2cd4da1..85b0f2f9 100644
--- a/task.c
+++ b/task.c
@@ -351,7 +351,7 @@ void TaskRemove(pTaskMan self, TaskFunc pTaskRun, void *pData)
   int iRet;
   pTaskHead pCurrent, pNext;
 
-  assert(self);
+  if (self == NULL) return;
   assert(self->iID == TASKERID);
 
   pNext = self->pHead->pNext;   /* skip dummy task */