diff --git a/css/style_dark.css b/css/style_dark.css
index 5ad58b3..498272e 100644
--- a/css/style_dark.css
+++ b/css/style_dark.css
@@ -84,7 +84,7 @@ thead, #networkMenu {
     position: relative;
 /*    overflow: auto;*/
     overflow-x: hidden;
-    overflow-y: scroll;
+    overflow-y: auto;
 }
 
 /* tertiary highlight selection */
diff --git a/js/Graph.js b/js/Graph.js
index df70833..c7b7534 100644
--- a/js/Graph.js
+++ b/js/Graph.js
@@ -182,7 +182,11 @@ NodeArray.prototype = {
     },
 
     find : function(key) {
-        return this.contents[key];
+        if (key in this.contents)
+            return this.contents[key];
+        else
+            console.log('no item matching key:', key);
+        return null;
     }
 };
 
diff --git a/webmapper.py b/webmapper.py
index 5cbff56..68bae4f 100644
--- a/webmapper.py
+++ b/webmapper.py
@@ -172,6 +172,8 @@ def map_props(map):
 
 def on_device(type, dev, event):
 #    print('ON_DEVICE:', event, dev)
+    if dev['is_local']:
+        return
     dev = dev_props(dev)
     if event == mpr.Graph.Event.NEW or event == mpr.Graph.Event.MODIFIED:
         new_devs[dev['key']] = dev
@@ -181,6 +183,8 @@ def on_device(type, dev, event):
 
 def on_signal(type, sig, event):
 #    print('ON_SIGNAL:', event)
+    if sig['is_local']:
+        return
     sig = sig_props(sig)
     if event == mpr.Graph.Event.NEW or event == mpr.Graph.Event.MODIFIED:
         new_sigs[sig['key']] = sig
@@ -188,7 +192,9 @@ def on_signal(type, sig, event):
         del_sigs[sig['key']] = sig
 
 def on_map(type, map, event):
-#    print('ON_MAP:', event)
+#    print('ON_MAP:', event, type, map)
+    if map['is_local']:
+        return
     map = map_props(map)
     if event == mpr.Graph.Event.NEW or event == mpr.Graph.Event.MODIFIED:
         new_maps[map['key']] = map