Creating a Blueprint Variable for InputActionKeyMappings, and then removing the default input parameter causes crash.

UE - Gameplay - Input - Nov 9, 2018

Upon creation and compilation of a Blueprint Variable of type InputActionKeyMappings, when clicking the "X" to remove the default input key parameter causes the editor to crash. ...

Copy+Paste with custom widget seems to "break link" with default values

UE - Editor - UI Systems - Nov 8, 2018

It should be noted that this issue does not occur if you were to create a new "test widget" (by dragging it from the widget list) every time instead of copying and pasting an existing widget. The i ...

Calling "GetCameraImage" rapidly ~10 times causes ARKit camera feed to stop updating

UE - Platform - XR - Nov 8, 2018

If you call the "GetCameraImage" function rapidly ~10 times, it causes the ARKit camera feed to stop updating.  Waiting for awhile or tapping some more seems to bring it back.   Tested on macOS H ...

iPhone X Notch is off center on XR and XS Max when selecting their screen size in a UMG Widget

UE - Platform - Mobile - Nov 8, 2018

The iPhone X notch is off center on the XS Max and the XR. ...

Blueprint Structure breaks when the Editor is closed and re-opened if the struct contains variables that are a Class Reference and a Soft Object Reference to a Blueprint

UE - Gameplay - Blueprint - Nov 8, 2018

A struct containing variables that are a Class Reference and Soft Object Reference to a Blueprint no longer works after the project is closed and re-opened in the Editor. If a variable of the struct ...

Progress Percent is removed from UMG Progress Bar when Transform Shear value is changed

UE - Graphics Features - Nov 8, 2018

Modifying the Shear values on a Progress Bar in a Widget Blueprint cause it to lose its Fill Color and set Progress. This is a regression from 4.20.3 (CL-4369336). Reproes with -vulkan on both Linux ...

Billboard Component Flickers Between Textures When Using Set Sprite Node

UE - Graphics Features - Nov 8, 2018

When using a Set Sprite node with a billboard component, the texture assigned will flicker between the two possible textures. Working as expected in 4.20 CL# 4369336 Found in 4.21 CL# 4541578, 4.2 ...

Sequence director fires events multiple times if multiple levels are streaming.

UE - Anim - Sequencer - Nov 7, 2018

The new event track in level sequences fires the number of times that there are levels streaming. ...

Skeletal Mesh Ref Skeleton can be built before Skeleton has finished loading, meaning it misses Virtual Bones

OLD - Anim - Nov 7, 2018

Skeletal Mesh Ref Skeleton can be built before Skeleton has finished loading, meaning it misses Virtual Bones. Need to force Skeleton to finish loading before building ref skeleton (Like animation a ...

Multiple Steam NetConnections to a single session are recorded incorrectly during cleanup

UE - Online - Nov 6, 2018

When introduced with two Steam NetDrivers/NetConnections to the same user, instead of closing out the communications on a per channel basis, the entire session is removed from the connection list. T ...