diff --git a/HISTORY.md b/HISTORY.md
index 243d4d50..c08116f9 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -48,6 +48,7 @@
     * Chinese, thanks, Simon!
 
 ### 2021-10-28
+* introduced default values for expandable slot specs
 * updated German translation
 * migrated Basque and Swedish translations to new BROADCAST block specs
 
diff --git a/snap.html b/snap.html
index 9f1cf483..93a9674a 100755
--- a/snap.html
+++ b/snap.html
@@ -16,9 +16,9 @@
         <script src="src/morphic.js?version=2021-07-09"></script>
         <script src="src/symbols.js?version=2021-03-03"></script>
         <script src="src/widgets.js?version=2021-10-26"></script>
-        <script src="src/blocks.js?version=2021-10-22"></script>
+        <script src="src/blocks.js?version=2021-10-28"></script>
         <script src="src/threads.js?version=2021-10-22"></script>
-        <script src="src/objects.js?version=2021-10-26"></script>
+        <script src="src/objects.js?version=2021-10-28"></script>
         <script src="src/scenes.js?version=2021-10-12"></script>
         <script src="src/gui.js?version=2021-10-27"></script>
         <script src="src/paint.js?version=2021-07-05"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 15c9ecee..d59b046f 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -160,7 +160,7 @@ CustomCommandBlockMorph, ToggleButtonMorph, DialMorph, SnapExtensions*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2021-October-22';
+modules.blocks = '2021-October-28';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -312,6 +312,7 @@ SyntaxElementMorph.prototype.labelParts = {
         tags: 'numeric read-only unevaluated landscape static'
         menu: dictionary or selector
         react: selector
+        value: string, number or Array for localized strings / constants
     */
     '%s': {
         type: 'input'
@@ -519,7 +520,8 @@ SyntaxElementMorph.prototype.labelParts = {
     '%rcv': {
         type: 'input',
         tags: 'read-only',
-        menu: 'receiversMenu'
+        menu: 'receiversMenu',
+        value: ['all']
     },
     '%spr': {
         type: 'input',
@@ -1703,6 +1705,17 @@ SyntaxElementMorph.prototype.labelPart = function (spec) {
             throw new Error('unknown label part type: "' + info.type + '"');
         }
 
+        // apply the default value
+        // -----------------------
+        // only for input slots and Boolean inputs,
+        // and only for rare exceptions where we cannot
+        // specify the default values in the block specs,
+        // e.g. for expandable "reeiver" slots in "broadcast"
+
+        if (!isNil(info.value)) {
+            part.setContents(info.value);
+        }
+
         // apply the tags
         // ---------------
         // input: numeric, read-only, unevaluated, landscape, static
diff --git a/src/objects.js b/src/objects.js
index e5908176..f49ea5c2 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -87,7 +87,7 @@ BlockVisibilityDialogMorph*/
 
 /*jshint esversion: 6*/
 
-modules.objects = '2021-October-26';
+modules.objects = '2021-October-28';
 
 var SpriteMorph;
 var StageMorph;
@@ -762,14 +762,12 @@ SpriteMorph.prototype.initBlocks = function () {
         doBroadcast: {
             type: 'command',
             category: 'control',
-            spec: 'broadcast %msg %receive',
-            defaults: [null, ['all']]
+            spec: 'broadcast %msg %receive'
         },
         doBroadcastAndWait: {
             type: 'command',
             category: 'control',
-            spec: 'broadcast %msg %receive and wait',
-            defaults: [null, ['all']]
+            spec: 'broadcast %msg %receive and wait'
         },
         doWait: {
             type: 'command',