diff --git a/app/src/main/java/com/codigoparallevar/minicards/parts/ProgramakerCustomBlockPart.java b/app/src/main/java/com/codigoparallevar/minicards/parts/ProgramakerCustomBlockPart.java
index ae36479..d0ac007 100644
--- a/app/src/main/java/com/codigoparallevar/minicards/parts/ProgramakerCustomBlockPart.java
+++ b/app/src/main/java/com/codigoparallevar/minicards/parts/ProgramakerCustomBlockPart.java
@@ -411,6 +411,9 @@ public class ProgramakerCustomBlockPart implements Part {
         if (pulseOutput != null) {
             pulseOutput.send(new Signal());
         }
+
+        // Notify screen that there's updates
+        this._partGrid.update();
     }
 
     private void freeBlock(String token) {
@@ -511,11 +514,18 @@ public class ProgramakerCustomBlockPart implements Part {
             return; // Logic block, don't show on user-mode
         }
 
+        boolean operationInProgress = this.token != null;
+
         drawConnectors(canvas);
         drawWires(canvas, devMode);
 
         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
-        paint.setColor(Color.WHITE);
+        if (operationInProgress) {
+            paint.setColor(Color.YELLOW);
+        }
+        else {
+            paint.setColor(Color.WHITE);
+        }
         canvas.drawRect(
                 new Rect(get_left(), get_top(),
                         get_right(), get_bottom()),