User-instanced subobjects owned by a streaming sublevel's Blueprint CDO cannot be garbage collected with the owning world after the sublevel has been reloaded in the editor.

UE - Gameplay - Blueprint - Feb 5, 2020

Strong object reference properties of an 'EditInline'-decorated UCLASS type embedded within a native C++ struct definition can be instanced at edit time by the user as part of a variable's default v ...

Runtime-generated components stored in the VisibleAnywhere array are not displayed in the detail panel

UE - Gameplay - Components - Jun 30, 2022

Runtime-generated components stored in ObjectPtr with VisibleAnywhere are displayed in the details panel, but not for arrays. Applying the following workaround, components can be visible even in ar ...

[CrashReport] Failed assert during BP compilation (trying to call a default delegate) (UE4Editor_KismetCompiler!FScriptBuilderBase::EmitFunctionCall() [kismetcompilervmbackend.cpp:1216])

UE - Gameplay - Oct 27, 2017

This is a trending crash coming out of the 4.18 release. User DescriptionsI tried to call an Event Dispatcher (which is assigned in the Level Blueprint) in the Construction Script of the Blueprint ...

Crash when using ComplexCollisionMesh and the ComplexCollisionMesh has more material index than drawing mesh's material index

UE - Simulation - Physics - Mar 2, 2020

When using ComplexCollisionMesh of StaticMesh asset, at the time of hit, the physical material refers to the material of the drawing mesh side using the material index of the collision mesh side. T ...

StrategyGame build failure from with XCode9

UE - Platform - Mobile - Jul 19, 2017

Did not occur when building the 3rd Person Code template from Windows to XCode 9. Also did not occur when building StrategyGame from Windows to XCode 8. This hasn't yet been tested natively on a Ma ...

Data Asset Deserialization crash after upgrading 4.19.2 to 421.1

UE - Foundation - Core - Feb 7, 2019

The User has provided an extensive log of their code base setup, and the process leading up to when the Assert occurs. "Our game mode & player state FSM are setup in a data driven manor using UDa ...

[CrashReport] Mac assertion - FSourceCodeNavigationImpl::NavigateToFunctionSource()

UE - Platform - Apple - Sep 27, 2017

This is a trending Mac crash coming out of the 4.18 Previews. Users have not provided any descriptions of their actions when the crash occurred. Callstack from LogLogMetal: Display: Loaded a text ...

Using a Wait Delay node on Linux causes editor to immediately close without crashing

UE - Platform - Linux - Sep 14, 2015

If a call is made to the blueprint node Wait Delay the editor will immediately close during PIE when the call is made without the crash reporter appearing. The "Wait Delay" node only exists on Linu ...

Actor corruption due to Hierarchy broken after load

UE - World Creation - Worldbuilding Tools - World Partition - Apr 25, 2023

We recently hit a situation where some actors would suddenly teleport across the map when they were modified in the editor. We figured out that the AttachParent of some actors got reset on editor l ...

Game language settings regression

UE - Editor - UI Systems - Localization - Jun 8, 2017

Fixed in Dev-Editor (CL# 3479874). Needs merging. ...