diff --git a/src/blocks/scratch3_looks.js b/src/blocks/scratch3_looks.js
index 546f594df..e173ca04d 100644
--- a/src/blocks/scratch3_looks.js
+++ b/src/blocks/scratch3_looks.js
@@ -244,9 +244,8 @@ class Scratch3LooksBlocks {
     getMonitored () {
         return {
             looks_size: {isSpriteSpecific: true},
-            looks_costumeorder: {isSpriteSpecific: true},
-            looks_backdroporder: {},
-            looks_backdropname: {}
+            looks_costumenumbername: {isSpriteSpecific: true},
+            looks_backdropnumbername: {}
         };
     }
 
diff --git a/src/blocks/scratch3_sensing.js b/src/blocks/scratch3_sensing.js
index 4f977a612..0cd4dde6d 100644
--- a/src/blocks/scratch3_sensing.js
+++ b/src/blocks/scratch3_sensing.js
@@ -56,7 +56,6 @@ class Scratch3SensingBlocks {
             sensing_answer: {},
             sensing_loudness: {},
             sensing_timer: {},
-            sensing_of: {},
             sensing_current: {}
         };
     }
diff --git a/src/engine/blocks.js b/src/engine/blocks.js
index 920128dc6..b889f2010 100644
--- a/src/engine/blocks.js
+++ b/src/engine/blocks.js
@@ -3,6 +3,7 @@ const mutationAdapter = require('./mutation-adapter');
 const xmlEscape = require('../util/xml-escape');
 const MonitorRecord = require('./monitor-record');
 const Clone = require('../util/clone');
+const {Map} = require('immutable');
 
 /**
  * @fileoverview
@@ -382,22 +383,38 @@ class Blocks {
                     block.fields[args.name].id = args.value;
                 }
             } else {
+                // Changing the value in a dropdown
                 block.fields[args.name].value = args.value;
+
+                if (!optRuntime){
+                    break;
+                }
+
+                const flyoutBlock = block.shadow && block.parent ? this._blocks[block.parent] : block;
+                if (flyoutBlock.isMonitored) {
+                    optRuntime.requestUpdateMonitor(Map({
+                        id: flyoutBlock.id,
+                        params: this._getBlockParams(flyoutBlock)
+                    }));
+                }
             }
             break;
         case 'mutation':
             block.mutation = mutationAdapter(args.value);
             break;
-        case 'checkbox':
+        case 'checkbox': {
             block.isMonitored = args.value;
-            if (optRuntime) {
-                const isSpriteSpecific = optRuntime.monitorBlockInfo.hasOwnProperty(block.opcode) &&
-                    optRuntime.monitorBlockInfo[block.opcode].isSpriteSpecific;
-                block.targetId = isSpriteSpecific ? optRuntime.getEditingTarget().id : null;
+            if (!optRuntime) {
+                break;
             }
-            if (optRuntime && wasMonitored && !block.isMonitored) {
+
+            const isSpriteSpecific = optRuntime.monitorBlockInfo.hasOwnProperty(block.opcode) &&
+                optRuntime.monitorBlockInfo[block.opcode].isSpriteSpecific;
+            block.targetId = isSpriteSpecific ? optRuntime.getEditingTarget().id : null;
+            
+            if (wasMonitored && !block.isMonitored) {
                 optRuntime.requestRemoveMonitor(block.id);
-            } else if (optRuntime && !wasMonitored && block.isMonitored) {
+            } else if (!wasMonitored && block.isMonitored) {
                 optRuntime.requestAddMonitor(MonitorRecord({
                     // @todo(vm#564) this will collide if multiple sprites use same block
                     id: block.id,
@@ -411,6 +428,7 @@ class Blocks {
             }
             break;
         }
+        }
 
         this.resetCache();
     }