diff --git a/HISTORY.md b/HISTORY.md
index 6b3e4dfc..9fb3eb9f 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,11 @@
 
 ## in development:
 
+* **New Features:**
+    * new extension primitives
+* **Notable Fixes:**
+    * fixed occasional invisible error messages
+
 ### 2021-06-15
 * extensions: tweaked world-map primitives
 * updated maps library
@@ -14,6 +19,7 @@
 ' extensions: added tts
 * updated text-to-speech library
 * updated bar-charts library
+* fixed #2850 (occasional invisible error message), thanks, Ken, for the bug report!
 
 ### 2021-06-14
 * new dev version
diff --git a/snap.html b/snap.html
index a02fae7b..19cbb729 100755
--- a/snap.html
+++ b/snap.html
@@ -8,7 +8,7 @@
         <script src="src/morphic.js?version=2021-02-10"></script>
         <script src="src/symbols.js?version=2021-03-03"></script>
         <script src="src/widgets.js?version=2021-01-05"></script>
-        <script src="src/blocks.js?version=2021-06-14"></script>
+        <script src="src/blocks.js?version=2021-06-15"></script>
         <script src="src/threads.js?version=2021-06-14"></script>
         <script src="src/objects.js?version=2021-06-14"></script>
         <script src="src/gui.js?version=2021-06-14"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 452e07ef..e85bb344 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -158,7 +158,7 @@ CustomCommandBlockMorph, ToggleButtonMorph, DialMorph, SnapExtensions*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2021-June-14';
+modules.blocks = '2021-June-15';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -2095,11 +2095,11 @@ SyntaxElementMorph.prototype.showBubble = function (value, exportPic, target) {
         img,
         morphToShow,
         isClickable = false,
-        ide = this.parentThatIsA(IDE_Morph),
+        ide = this.parentThatIsA(IDE_Morph) || target.parentThatIsA(IDE_Morph),
         anchor = this,
         pos = this.rightCenter().add(new Point(2, 0)),
         sf = this.parentThatIsA(ScrollFrameMorph),
-        wrrld = this.world();
+        wrrld = this.world() || target.world();
 
     if ((value === undefined) || !wrrld) {
         return null;