Particle record in the Matinee leads to crash when playing after record.

Tools - Oct 19, 2017

Particle record feature in the matinee seems not properly working in the Editor. When trying to play in the matinee with recorded keys, the Engine will crash with Access violation - code c0000005. ...

NaN is handled differently when clamped on Windows and Android/iOS

UE - Platform - Mobile - Oct 18, 2017

NaN (Not a Number) is handled different when clamped on Windows and Android/iOS. If you clamp a NaN (Acheived by -3 ^ 0.2 in the reproduction project) from 0.0 to 1.0 and then print the result, you' ...

Collision channel settings are not recognized in Standalone

OLD - Anim - Oct 18, 2017

Object instances that override the parent blueprint's collision settings are recognized in PIE but ignored in standalone or when running from the command line with -game NOTE: This appears to only ...

Flickering in Material Editor Preview when Absolute World Position node used

UE - Graphics Features - Oct 17, 2017

Creating a material with "Absolute World Position" node plugged into the "World Position Offset" input of the base Material node results in flickering in the preview window of the material editor. ...

VisibleAnywhere specifier doesn't prevent components from being edited in property windows

UE - Gameplay - Blueprint - Oct 17, 2017

Using the VisibleAnywhere specifier in a UPROPERTY declaration does not prevent a Component's properties from being edited in property windows. This conflicts with the description of this specifier ...

Meta specifier MustImplement does not list eligible blueprints that have not been opened/loaded

UE - Gameplay - Blueprint - Oct 16, 2017

Using the meta specifier MustImplement will cause the associated dropdown to only list classes/blueprints that implement the provided interface. If a blueprint has not been opened/loaded in the edit ...

Draw Brush Polys setting does not display translucent Material

Tools - Oct 13, 2017

The Draw Brush Polys setting does not display translucent Material in versions 4.17 and higher, instead, checking the option appears to do nothing. This issue does not occur in 4.16.3, this issue is ...

OnActorSpawned is called prior to FinishedSpawning for PlayerControllers and actors spawned with bDeferConstruction set to true

UE - Gameplay - Oct 12, 2017

When a PlayerController or any actor with bDeferConstruction set to true is spawned, OnActorSpawned.Broadcast is called prior to FinishSpawning which can cause issues as some components may not be i ...

[CrashReport] UE4Editor_SlateCore!SWindow::IsVisible() [swindow.cpp:1320]

Tools - Oct 12, 2017

This is a trending crash coming out of the 4.18 previews and 4.18.0. The callstack is similar to a Mac crash that was fixed in 4.16.2 - [Link Removed] User Descriptionswas testing 3rd person temp ...

Packaged iOS project incorrectly includes level not selected to be cooked

UE - Foundation - Core - Cooker - Oct 11, 2017

When packaging for iOS on a Mac, the default level for a project will always be included in the packaged project even if it was not selected to be cooked and packaged. The expected behavior is that ...