diff --git a/HISTORY.md b/HISTORY.md
index 3efe3b9b..b2ec2383 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -71,6 +71,7 @@
 
 ### 2021-12-07
 * objects: backwards-compatibility fix for key-event hat blocks
+* store, objects: load category-less custom blocks into "other"
 
 ### 2021-12-06
 * blocks, threads: refactored block assembly, experimental
diff --git a/snap.html b/snap.html
index ff977eed..44243560 100755
--- a/snap.html
+++ b/snap.html
@@ -30,7 +30,7 @@
         <script src="src/maps.js?version=2021-06-15"></script>
         <script src="src/extensions.js?version=2021-11-22"></script>
         <script src="src/xml.js?version=2021-07-05"></script>
-        <script src="src/store.js?version=2021-11-24"></script>
+        <script src="src/store.js?version=2021-12-07"></script>
         <script src="src/locale.js?version=2021-12-06"></script>
         <script src="src/cloud.js?version=2021-02-04"></script>
         <script src="src/api.js?version=2021-11-17"></script>
diff --git a/src/store.js b/src/store.js
index 41f5cb49..b99a169e 100644
--- a/src/store.js
+++ b/src/store.js
@@ -63,7 +63,7 @@ Project*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.store = '2021-November-24';
+modules.store = '2021-December-07';
 
 // XML_Serializer ///////////////////////////////////////////////////////
 /*
@@ -971,6 +971,11 @@ SnapSerializer.prototype.loadCustomBlocks = function (
             object
         );
         definition.category = child.attributes.category || 'other';
+        if (!SpriteMorph.prototype.allCategories().includes(
+            definition.category
+        )) {
+            definition.category = 'other';
+        }
         definition.type = child.attributes.type || 'command';
         definition.isHelper = (child.attributes.helper === 'true') || false;
         definition.isGlobal = (isGlobal === true);
diff --git a/src/threads.js b/src/threads.js
index 96d1ce49..adcba17c 100644
--- a/src/threads.js
+++ b/src/threads.js
@@ -64,7 +64,7 @@ SnapExtensions, AlignmentMorph, TextMorph, Cloud, HatBlockMorph*/
 
 /*jshint esversion: 6*/
 
-modules.threads = '2021-December-06';
+modules.threads = '2021-December-07';
 
 var ThreadManager;
 var Process;
@@ -5670,7 +5670,7 @@ Process.prototype.reportGet = function (query) {
                 ).map(
                     def => def.blockInstance().reify()
                 ).concat(
-                    SpriteMorph.prototype.allCategories().reduce(
+                    SpriteMorph.prototype.categories.reduce(
                         (blocks, category) => blocks.concat(
                             thisObj.getPrimitiveTemplates(
                                 category