diff --git a/platform/features/layout/src/FixedController.js b/platform/features/layout/src/FixedController.js
index db742aa3da..465d6a1d3b 100644
--- a/platform/features/layout/src/FixedController.js
+++ b/platform/features/layout/src/FixedController.js
@@ -253,6 +253,7 @@ define(
                 if (e.isDefaultPrevented()) {
                     return;
                 }
+                e.preventDefault();
                 // Store the position of this element.
                 addElement({
                     type: "fixed.telemetry",
diff --git a/platform/features/layout/test/FixedControllerSpec.js b/platform/features/layout/test/FixedControllerSpec.js
index a858910d76..b4e05c9665 100644
--- a/platform/features/layout/test/FixedControllerSpec.js
+++ b/platform/features/layout/test/FixedControllerSpec.js
@@ -34,6 +34,7 @@ define(
                 mockFormatter,
                 mockDomainObject,
                 mockSubscription,
+                mockEvent,
                 testGrid,
                 testModel,
                 testValues,
@@ -98,6 +99,10 @@ define(
                     'subscription',
                     [ 'unsubscribe', 'getTelemetryObjects', 'getRangeValue' ]
                 );
+                mockEvent = jasmine.createSpyObj(
+                    'event',
+                    [ 'preventDefault', 'isDefaultPrevented' ]
+                );
 
                 testGrid = [ 123, 456 ];
                 testModel = {
@@ -302,7 +307,7 @@ define(
                 // Notify that a drop occurred
                 testModel.composition.push('d');
                 findOn('mctDrop')(
-                    {},
+                    mockEvent,
                     'd',
                     { x: 300, y: 100 }
                 );
@@ -310,12 +315,31 @@ define(
                 // Should have added an element
                 expect(testConfiguration.elements.length).toEqual(4);
 
+                // ...and prevented default...
+                expect(mockEvent.preventDefault).toHaveBeenCalled();
+
                 // Should have triggered commit (provided by
                 // EditRepresenter) with some message.
                 expect(mockScope.commit)
                     .toHaveBeenCalledWith(jasmine.any(String));
             });
 
+            it("ignores drops when default has been prevented", function () {
+                // Avoids redundant drop-handling, WTD-1233
+                mockEvent.isDefaultPrevented.andReturn(true);
+
+                // Notify that a drop occurred
+                testModel.composition.push('d');
+                findOn('mctDrop')(
+                    mockEvent,
+                    'd',
+                    { x: 300, y: 100 }
+                );
+
+                // Should NOT have added an element
+                expect(testConfiguration.elements.length).toEqual(3);
+            });
+
             it("unsubscribes when destroyed", function () {
                 // Make an object available
                 findWatch('domainObject')(mockDomainObject);
@@ -403,4 +427,4 @@ define(
             });
         });
     }
-);
\ No newline at end of file
+);
diff --git a/platform/features/layout/test/LayoutControllerSpec.js b/platform/features/layout/test/LayoutControllerSpec.js
index 95134c298b..d6cc3d035b 100644
--- a/platform/features/layout/test/LayoutControllerSpec.js
+++ b/platform/features/layout/test/LayoutControllerSpec.js
@@ -28,6 +28,7 @@ define(
 
         describe("The Layout controller", function () {
             var mockScope,
+                mockEvent,
                 testModel,
                 testConfiguration,
                 controller;
@@ -37,6 +38,10 @@ define(
                     "$scope",
                     [ "$watch", "$on", "commit" ]
                 );
+                mockEvent = jasmine.createSpyObj(
+                    'event',
+                    [ 'preventDefault', 'isDefaultPrevented' ]
+                );
 
                 testModel = {
                     composition: [ "a", "b", "c" ]
@@ -144,17 +149,32 @@ define(
                 // Notify that a drop occurred
                 testModel.composition.push('d');
                 mockScope.$on.mostRecentCall.args[1](
-                    {},
+                    mockEvent,
                     'd',
                     { x: 300, y: 100 }
                 );
                 expect(testConfiguration.panels.d).toBeDefined();
+                expect(mockEvent.preventDefault).toHaveBeenCalled();
 
                 // Should have triggered commit (provided by
                 // EditRepresenter) with some message.
                 expect(mockScope.commit)
                     .toHaveBeenCalledWith(jasmine.any(String));
             });
+
+            it("ignores drops when default has been prevented", function () {
+                // Avoids redundant drop-handling, WTD-1233
+                mockEvent.isDefaultPrevented.andReturn(true);
+
+                // Notify that a drop occurred
+                testModel.composition.push('d');
+                mockScope.$on.mostRecentCall.args[1](
+                    mockEvent,
+                    'd',
+                    { x: 300, y: 100 }
+                );
+                expect(testConfiguration.panels.d).not.toBeDefined();
+            });
         });
     }
-);
\ No newline at end of file
+);