Mentioning "_Validate" suffix in code comments to function names causes Compiler error

UE - Foundation - Cpp Tools - UnrealHeaderTool - Dec 13, 2019

When mentioning the _Validate Suffix in code comment, Visual Studio compiler throws an error. ...

Texture asset only exportable as .COPY and .T3D

UE - Editor - Content Pipeline - Import and Export - Dec 13, 2019

Export for certain marketplace asset limited to .COPY and .T3D (and .BMP in 4.24) I was unable to reproduce this with a texture that I created even with Grayscale / sRGB disabled. ...

iOS CloudKit Crash

UE - Platform - Mobile - Dec 12, 2019

iOS app crashes when cloudsaves are active When attempting to deploy with 4.25 MAIN @ CL 10668484 it fails with error LogPlayLevel: === BUILD TARGET AJ_ioscloudsave OF PROJECT AJ_ioscloudsave WI ...

Niagara crash when duplicating an emitter in the timeline through right-click menu

UE - Niagara - Dec 11, 2019

Trying to duplicate an emitter from the timeline crashes the editor. This looks to be the result of UMovieSceneNiagaraEmitterTrack not implementing the function SupportsType.  ...

Material Instance Parameters Undo Doesn't Update Values

Tools - Dec 11, 2019

Material Instance parameters do not update values when the user does an Undo (Ctrl+Z). An example project is attached. This seem related to [Link Removed]. Found in 4.24 CL#10570792 Reproduced in ...

Engine Crashes When Converting an Int to Float For a Map Key In Blueprints

UE - Gameplay - Blueprint Editor - Dec 11, 2019

The engine crashes when trying to automatically create a type conversion node when they are used a key for a map. Found in 4.24 CL#10570792 Reproduced in 4.25 Main CL# 10646676 ...

[CrashReport] UE4Editor-D3D11RHI!FD3D11RenderQueryBatcher::PerFrameFlush() [D3D11Query.cpp:45]

UE - Graphics Features - Dec 11, 2019

Generated from CrashReporter ...

Blueprint Actor cannot delete implemented interface when Interface is converted to an Event.

UE - Gameplay - Blueprint - Dec 11, 2019

In Editor, When you remove a return value parameter from a Blueprint Interface function's Output Category. (so there are no return values), it becomes an event. In any Blueprint that implements the ...

Sub Instance Root Motion issues

OLD - Anim - Dec 10, 2019

Using multiple Sub instances with root motion does not behave as expected. With both the parent and sub instances set to 'Root Motion from Everything': In 4.22, too much root motion occurs. In ...