diff --git a/Participant.cs b/Participant.cs
index ffecf5d..40f71ed 100644
--- a/Participant.cs
+++ b/Participant.cs
@@ -134,7 +134,9 @@ namespace Passer.Control.Core {
                 this.nextPublishMe = currentTimeMS + this.publishInterval;
             }
 
-            foreach (Thing thing in this.things) {
+            int n = this.things.Count;
+            for (int ix = 0; ix < n; ix++) {
+                Thing thing = this.things[ix];
                 if (thing != null && thing.parent == null) // update only root things
                     thing.Update(currentTimeMS);
             }
diff --git a/RemoteParticipant.cs b/RemoteParticipant.cs
index 500bc41..cc3c0ce 100644
--- a/RemoteParticipant.cs
+++ b/RemoteParticipant.cs
@@ -31,13 +31,17 @@ namespace Passer.Control.Core {
             Thing foundThing = Get(thing.networkId, thing.id);
 
             if (foundThing == null) {
-                // if (thing.id == 0)
-                //     thing.id = (byte)(things.Count + 1);
                 things.Add(thing);
 
                 if (invokeEvent)
                     Thing.InvokeNewThing(thing);
                 // Console.Write($"Add thing {ipAddress}:{port}[{networkId}/{thing.id}]");
+            } else {
+                if (thing != foundThing) {
+                    // should be: find first non-existing id...
+                    thing.id = (byte)this.things.Count;
+                    things.Add(thing);
+                }
             }
         }
 
diff --git a/Unity/DistanceSensor.cs b/Unity/DistanceSensor.cs
index c623c15..6dc1fdf 100644
--- a/Unity/DistanceSensor.cs
+++ b/Unity/DistanceSensor.cs
@@ -22,7 +22,7 @@ namespace Passer.Control.Unity {
             GameObject distanceObj = new("Distance sensor");
             DistanceSensor component = distanceObj.AddComponent<DistanceSensor>();
             if (parent != null && parent.component != null)
-                distanceObj.transform.SetParent(parent.component.transform);
+                distanceObj.transform.SetParent(parent.component.transform, false);
 
             return component;
         }
diff --git a/Unity/SiteServer.cs b/Unity/SiteServer.cs
index 628ab09..6431eb3 100644
--- a/Unity/SiteServer.cs
+++ b/Unity/SiteServer.cs
@@ -22,6 +22,7 @@ namespace Passer.Control.Unity {
         }
 
         public void HandleNewThing(Core.Thing thing) {
+            site.Add(thing, false);
             thingQueue.Enqueue(thing);
         }
 
@@ -31,7 +32,6 @@ namespace Passer.Control.Unity {
                 thing.CreateComponent();
             }
         }
-
     }
 
 }