diff --git a/HISTORY.md b/HISTORY.md
index bec61b64..a9707115 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -49,6 +49,7 @@
 
 ### 2021-10-29
 * objects: flood-fill edge case fix, thanks, Dariusz!
+* gui: removed obsolete dev comments
 
 ### 2021-10-28
 * introduced default values for expandable slot specs
diff --git a/snap.html b/snap.html
index 90c1064b..6d80a2ec 100755
--- a/snap.html
+++ b/snap.html
@@ -20,7 +20,7 @@
         <script src="src/threads.js?version=2021-10-22"></script>
         <script src="src/objects.js?version=2021-10-29"></script>
         <script src="src/scenes.js?version=2021-10-12"></script>
-        <script src="src/gui.js?version=2021-10-28"></script>
+        <script src="src/gui.js?version=2021-10-29"></script>
         <script src="src/paint.js?version=2021-07-05"></script>
         <script src="src/lists.js?version=2021-07-19"></script>
         <script src="src/byob.js?version=2021-10-25"></script>
diff --git a/src/gui.js b/src/gui.js
index 16e34e43..51b80fd5 100644
--- a/src/gui.js
+++ b/src/gui.js
@@ -85,7 +85,7 @@ Animation, BoxMorph, BlockDialogMorph, RingMorph, Project, ZERO, BLACK*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2021-October-28';
+modules.gui = '2021-October-29';
 
 // Declarations
 
@@ -279,7 +279,8 @@ IDE_Morph.prototype.init = function (isAutoFill) {
     this.filePicker = null;
 
     // incrementally saving projects to the cloud is currently unused
-    this.hasChangedMedia = false; // +++ sceneify, or get of it
+    // and needs to be extended to work with scenes before reactivation
+    this.hasChangedMedia = false;
 
     this.isAnimating = true;
     this.paletteWidth = 200; // initially same as logo width
@@ -2283,7 +2284,7 @@ IDE_Morph.prototype.setProjectName = function (string) {
     if (name !== projectScene.name) {
         projectScene.name = name;
         projectScene.stage.version = Date.now();
-        this.recordUnsavedChanges(); // +++ sceneify this
+        this.recordUnsavedChanges();
         if (projectScene === this.scene) {
             this.controlBar.updateLabel();
         }
@@ -2300,7 +2301,7 @@ IDE_Morph.prototype.setProjectNotes = function (string) {
     if (string !== projectScene.notes) {
         projectScene.notes = string;
         projectScene.stage.version = Date.now();
-        this.recordUnsavedChanges(); // +++ sceneify this
+        this.recordUnsavedChanges();
         if (projectScene === this.scene) {
             this.controlBar.updateLabel();
         }
@@ -4944,7 +4945,7 @@ IDE_Morph.prototype.editNotes = function () {
 
     dialog.action = (note) => {
         this.scene.notes = note;
-        this.recordUnsavedChanges(); // +++ sceneify this
+        this.recordUnsavedChanges();
     };
 
     dialog.justDropped = () => text.edit();
@@ -9020,7 +9021,12 @@ LibraryImportDialogMorph.prototype.cachedLibrary = function (key) {
     return this.libraryCache[key];
 };
 
-LibraryImportDialogMorph.prototype.importLibrary = function () { // +++ clean up
+LibraryImportDialogMorph.prototype.importLibrary = function () {
+    // browsing and importing libraries needs to be redesigned because of
+    // custom categories introduced in v7.
+    // currently caching libraries is ignored when loading a library
+    // to avoid creating custom categories that were only looked at
+    // in the libraries browser.
     if (!this.listField.selected) {return; }
 
     var // blocks,
@@ -9031,7 +9037,7 @@ LibraryImportDialogMorph.prototype.importLibrary = function () { // +++ clean up
     // restore captured user-blocks categories
     SpriteMorph.prototype.customCategories = this.originalCategories;
 
-/*
+    /*
     if (this.hasCached(selectedLibrary)) {
         blocks = this.cachedLibrary(selectedLibrary);
         blocks.forEach(def => {
@@ -9041,7 +9047,7 @@ LibraryImportDialogMorph.prototype.importLibrary = function () { // +++ clean up
         });
         ide.showMessage(localize('Imported') + ' ' + localize(libraryName), 2);
     } else {
-*/
+    */
         ide.showMessage(localize('Loading') + ' ' + localize(libraryName));
         ide.getURL(
             ide.resourceURL('libraries', selectedLibrary),
@@ -9050,7 +9056,7 @@ LibraryImportDialogMorph.prototype.importLibrary = function () { // +++ clean up
                 this.isLoadingLibrary = true;
             }
         );
-//    }
+    // }
 };
 
 LibraryImportDialogMorph.prototype.displayBlocks = function (libraryKey) {
@@ -10804,11 +10810,11 @@ SceneIconMorph.prototype.renameScene = function () {
                     answer,
                     scene
                 );
-                scene.stage.version = Date.now(); // +++ also do this in other places
+                scene.stage.version = Date.now();
                 if (scene === ide.scene) {
                     ide.controlBar.updateLabel();
                 }
-                ide.recordUnsavedChanges(); // ++++ sceneify unsaved changes
+                ide.recordUnsavedChanges();
             }
         }
     ).prompt(