diff --git a/HISTORY.md b/HISTORY.md
index 479e6d00..6b988906 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,9 @@
 
 ## in development:
 
+### 2020-07-19
+* blocks: blocks-fade-out support for label arrows (under construction)
+
 ### 2020-07-17
 * morphic, blocks: blocks-fadeout (under construction)
 
diff --git a/snap.html b/snap.html
index f2a0eb5c..c8c3af5c 100755
--- a/snap.html
+++ b/snap.html
@@ -7,10 +7,10 @@
         <script src="src/morphic.js?version=2020-07-16"></script>
         <script src="src/symbols.js?version=2020-07-01"></script>
         <script src="src/widgets.js?version=2020-07-13"></script>
-        <script src="src/blocks.js?version=2020-07-15"></script>
+        <script src="src/blocks.js?version=2020-07-19"></script>
         <script src="src/threads.js?version=2020-07-09"></script>
         <script src="src/objects.js?version=2020-07-13"></script>
-        <script src="src/gui.js?version=2020-07-16"></script>
+        <script src="src/gui.js?version=2020-07-19"></script>
         <script src="src/paint.js?version=2020-05-17"></script>
         <script src="src/lists.js?version=2020-07-01"></script>
         <script src="src/byob.js?version=2020-07-01"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 3ac17879..d29effea 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -153,7 +153,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2020-July-17';
+modules.blocks = '2020-July-19';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -8643,7 +8643,9 @@ InputSlotMorph.prototype.init = function (
         arrow = new ArrowMorph(
             'down',
             0,
-            Math.max(Math.floor(this.fontSize / 6), 1)
+            Math.max(Math.floor(this.fontSize / 6), 1),
+            BLACK,
+            true
         );
 
     contents.fontSize = this.fontSize;
@@ -10634,14 +10636,15 @@ ArrowMorph.uber = Morph.prototype;
 
 // ArrowMorph instance creation:
 
-function ArrowMorph(direction, size, padding, color) {
-    this.init(direction, size, padding, color);
+function ArrowMorph(direction, size, padding, color, isBlockLabel) {
+    this.init(direction, size, padding, color, isBlockLabel);
 }
 
-ArrowMorph.prototype.init = function (direction, size, padding, color) {
+ArrowMorph.prototype.init = function (direction, size, padding, color, isLbl) {
     this.direction = direction || 'down';
     this.size = size || ((size === 0) ? 0 : 50);
     this.padding = padding || 0;
+    this.isBlockLabel = isLbl || false;
 
     ArrowMorph.uber.init.call(this);
     this.color = color || BLACK;
@@ -10669,7 +10672,7 @@ ArrowMorph.prototype.render = function (ctx) {
         w = this.width(),
         w2 = Math.floor(w / 2);
 
-    ctx.fillStyle = this.color.toString();
+    ctx.fillStyle = this.getRenderColor().toString();
     ctx.beginPath();
     if (this.direction === 'down') {
         ctx.moveTo(pad, h2);
@@ -10692,6 +10695,16 @@ ArrowMorph.prototype.render = function (ctx) {
     ctx.fill();
 };
 
+ArrowMorph.prototype.getRenderColor = function () {
+    if (this.isBlockLabel) {
+        if (MorphicPreferences.isFlat) {
+            return this.color;
+        }
+        return this.parent.alpha > 0.5 ? this.color : WHITE;
+    }
+    return this.color;
+};
+
 // TextSlotMorph //////////////////////////////////////////////////////
 
 /*
@@ -10721,7 +10734,9 @@ TextSlotMorph.prototype.init = function (
         arrow = new ArrowMorph(
             'down',
             0,
-            Math.max(Math.floor(this.fontSize / 6), 1)
+            Math.max(Math.floor(this.fontSize / 6), 1),
+            BLACK,
+            true
         );
 
     contents.fontSize = this.fontSize;
@@ -11049,7 +11064,8 @@ MultiArgMorph.prototype.init = function (
         'left',
         this.fontSize,
         Math.max(Math.floor(this.fontSize / 6), 1),
-        arrowColor
+        arrowColor,
+        true
     );
 
     // right arrow:
@@ -11057,7 +11073,8 @@ MultiArgMorph.prototype.init = function (
         'right',
         this.fontSize,
         Math.max(Math.floor(this.fontSize / 6), 1),
-        arrowColor
+        arrowColor,
+        true
     );
 
     // control panel:
diff --git a/src/gui.js b/src/gui.js
index 057d42fd..920c5dbf 100644
--- a/src/gui.js
+++ b/src/gui.js
@@ -78,7 +78,7 @@ Animation, BoxMorph, BlockEditorMorph, BlockDialogMorph, Note, ZERO, BLACK*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2020-July-17';
+modules.gui = '2020-July-19';
 
 // Declarations
 
@@ -3142,7 +3142,7 @@ IDE_Morph.prototype.settingsMenu = function () {
                     true,
                     alpha => {
                         SyntaxElementMorph.prototype.setAlphaScaled(alpha);
-                        this.rerender();
+                        this.changed();
                     }
                 );
             },