Background Blur widget renders with offset in PIE when within a Retainer Box

UE - Editor - UI Systems - Slate - Oct 10, 2019

The background blur widget does not render in the correct position in PIE when it is within a retainer box. It's likely that we're not applying the retainer window's offset properly when calling FSl ...

"Pausing" A TimeSynth causes a crash

UE - Audio - Oct 10, 2019

Clicking and holding anywhere on the editor outside the viewport when PIE causes a crash. The AudioRendering thread throws the following assert: Assertion failed: FreeClipIndex < PlayingClipsPool_Au ...

UnrealMathTest fails when compiled with VS2019

UE - Foundation - Cpp Tools - Oct 10, 2019

A crash or breakpoint is triggered when building UE4 with Project Files generated with -2019. Typeinfo.h was changed in MSVC v14.23 to just be typeinfo. ([Link Removed]) There is a pull request t ...

TMap entries are removed on Blueprint compile when using struct as key

UE - Gameplay - Blueprint Compiler - Oct 10, 2019

Map entries are removed on Blueprint compile when using struct as key.  ...

Event Blueprint Initialize Animation executes multiple times per instance per frame

UE - Anim - Runtime - Anim Blueprints - Oct 10, 2019

When editing the default values of a BP using an ABP, the ABP's initialize event will be triggered multiple times in a single frame.  ...

Screen Renders Black in a Packaged AREnvProbe Project

UE - Platform - XR - Oct 10, 2019

After pressing Start AR, the screen is black. It still renders planes occasionally and when you put a surface really close to the screen, it renders slighting in the black. This also occurs in //UE ...

UCharacterMovementComponent OldVelocity is pre-additive while Velocity is post-additive

UE - Gameplay - Player Movement - Oct 10, 2019

In UCharacterMovementComponent code such as PhysFalling, RestorePreAdditiveRootMotionVelocity is called before FVector OldVelocity = Velocity; leaving OldVelocity in a pre-additive state making furt ...

HLSLCC crashed on parsing UAV related instruction

UE - Graphics Features - Oct 10, 2019

1.glsl_type with image was not fully inited with HlslName field set, causing the crash 2.seems many types of op are not support by current hlslcc, cause error msg. e.g. RWTexture2D.Load[Image Remo ...

Screen tearing with ARKit enabled applications

UE - Platform - XR - Oct 9, 2019

Screen tearing occurs when navigating the device around the AR space. ...

Unable to delete levels with Particles in them

UE - Gameplay - Oct 9, 2019

The engine is unable to Level that has a Blueprint actor with a child actor component that has a particle system component. The follow message pops up: World /Game/LevelName.LevelName is in use. — ...