Replacing a UI widget element and then undoing it causes the Widget Blueprint's UI elements to be deleted on editor restart

UE - Editor - UI Systems - Jan 25, 2021

When using the Replace With option and then undoing it, upon engine restart the Widget Blueprint's UI components are all removed from the Widget Blueprint. It seems the undo is crucial to the issue, ...

Landscape can be added as a source in take recorder

UE - Anim - Sequencer - Jan 25, 2021

Landscapes should not be able to be animated in sequences, and should not appear as options for sources in take recorder.  ...

Adding a widget to a grid panel inside the grid panel tick can cause an out-of-bounds error

UE - Editor - UI Systems - Slate - Jan 25, 2021

This is caused by adding an item to a grid panel inside the grid panel iteration loop. The same operation to canvas panel goes well without any errors. The difference is that the array iteration in ...

Attach track in the Audio track of Level Sequence becomes Unresolved Binding when the Editor is restarted.

UE - Anim - Sequencer - Jan 22, 2021

It looks like the Actor's Binding information has not been saved successfully. ...

Crash when setting Retainerbox scale is set to 0 at runtime

UE - Editor - UI Systems - Jan 22, 2021

Crash at runtime when Retainerbox scale is set to 0. The call stack indicates that the size of RenderTarget2D is set to 0. Attached repro project sets the scale of the RetainerBox that wraps the Im ...

Combobox navigation does not work consistently

UE - Editor - UI Systems - Jan 22, 2021

Navigation on combo box widgets will sometimes fail until the combo box close button is pressed, despite it not being open. This appears to be related to accessibility features added in CL# 13258546 ...

Sequence with null skeletal track sections crashes on load

UE - Anim - Sequencer - Jan 21, 2021

Add contents of the zip file to your 4.26 project. Open the level sequence.  EXPECTED: It shoudln't crash. Log will print saying that it removed some animation sections. ...

Failure to add key and potential crash when adding keyframe to sequence through details panel

UE - Anim - Sequencer - Jan 21, 2021

There is the potential for a crash when adding a key through the details panel. In cases where there is no crash the key is not added.  ...

UMovieSceneUserImportFBXSettings is not a blueprint type.

UE - Anim - Sequencer - Jan 20, 2021

This class is needed for FBX importing through blueprints. It needs the BlueprintType class specifier. ...

Editor will crash on attempt to load a previously-saved Blueprint asset with a serialized default subobject containing a serialized static array of two or more nested subobject instances.

A crash will result if a Blueprint class that's based on a native C++ class containing two or more nested, explicitly-instanced subobjects referenced by a fixed-size object array property are serial ...