Importing static mesh while a PIE session is running permanently breaks nanite on the asset

UE - Editor - Content Pipeline - Import and Export - Mar 12, 2025

Importing a Static Mesh during PIE can cause it to never enable Nanite, even if it reports that Nanite is enabled. To re-enable Nanite on the mesh, the asset needs to be deleted and imported again ...

Project cannot build in VS 2017 15.8+ if it uses std::make_shared with an over-aligned type

UE - Foundation - Core - Aug 30, 2018

Visual Studio 2017 15.8 includes a fix to properly handle std::make_shared used with over-aligned types. However, this is a breaking fix and requires the definition of one of two macros to either ac ...

PropertyAccessUtil methods do not do propagation to instances when editing archetypes

UE - Editor - Workflow Systems - May 14, 2020

Currently value propagation is handled at the property node level (c.f., PropagateContainerPropertyChange), and is unavailable to any other editor code / scripting (whether in Python or BP or C++). ...

Editor Type Plugins are Included in Packaged Development Build

UE - Foundation - Cpp Tools - UnrealBuildTool - Feb 19, 2016

When you declare a plugin as "Editor" type, the plugin is still included in a packaged development build. Found in 4.10.3 binary. Reproduced in 4.11 Preview 5, and Main CL 2870013 ...

'Directions are not Compatible' error on ForEachLoopWithBreak if split struct pin is disconnected from Enum type

UE - Gameplay - Blueprint - Mar 25, 2015

'Directions are not Compatible' error on ForEachLoopWithBreak if split struct pin is disconnected from Enum type. Note: If the pins are reconstructed and the resplit, the error is fixed. ...

Crash when destroying two components in a specific order in this user's project

UE - Gameplay - Blueprint - Oct 6, 2015

Crash when destroying two components in a specific order in this user's project. The crash occurs under two circumstances inside the LogActor Blueprint: either DestroyLogPart is called for both Te ...

Damping is handled differently at lower frame rates

UE - Gameplay - Aug 3, 2016

Damping is handled differently at lower frame rates. Slight changes in damping at lower FPS (25) drastically effects objects and isn't applied in the same way as at higher FPS (60) User Description ...

Destructible mesh traces fail after switching collision response

UE - Simulation - Physics - Destruction - Jun 15, 2017

User reported issue on UDN, steps above and project attached. ...

NPC - Initializing a System parameter to a Niagara Parameter Collection data interface parameter does not work

UE - Niagara - Data Interface - Jan 4, 2021

Initializing a System parameter to a Niagara Parameter Collection data interface parameter does not work ...

[CrashReport] UE4Editor_Core!FGenericPlatformMemory::OnOutOfMemory() [genericplatformmemory.cpp:184] - FPngImageWrapper::UncompressPNGData

Tools - Mar 23, 2018

Comment for user in crash group:Just add automotive project to my account, add it as 4.18, and each time trying to laod it, it crashes... 174 if (GWarn) 175 { 176 GMallo ...