An imported file that resides within the project's folders gets a relative path. That path is not updated it you copy the uasset to another folder. That breaks the Reimporting functionality.

UE - Editor - Content Pipeline - Import and Export - Aug 28, 2024

An imported file that resides within the project's folders gets a relative path. That path is not updated it you copy the uasset to another folder, so from the location of the new asset's the relati ...

Launcher and Editor context / dropdown menus do not display correctly on upcoming Windows 10 build

UE - Editor - UI Systems - Slate - Oct 3, 2016

A few users using the Windows 10 Insider Preview have found that after a certain point in the Prerelease builds, starting at 14915 it seems, the Unreal Editor and Epic Games Launcher context menus h ...

Crash in FWebRemoteControlModule::HandleBatchRequest() when not enforcing passphrase on requests

UE - Virtual Production - IO - RemoteControl - Mar 20, 2026

When a client sends a request with no passphrase to Unreal Remote Control's "/remote/batch" endpoint, and the plugin is configured to not perform passphrase verification, the Editor will crash as so ...

Rhino blocks not placed correctly when imported

UE - Editor - Content Pipeline - Datasmith - Importer - Oct 15, 2018

The Rhino blocks are imported with the base point at the origin, causing them to import inside of each other when the process is complete. In 4.20 (4.20E4) the blocks are imported apart from each ot ...

Fbx Importer: Make sure the blendshape curve keys have the correct tangent scale

UE - Anim - Oct 4, 2021

The tangent of the blendshape curve seam to have the wrong scale (but correct direction) from this UDN. https://udn.unrealengine.com/s/question/0D54z000079J03OCAS/skip-compressing-anims-and-buildin ...

Change GetDisplayName to same behavior in all builds.

UE - Gameplay - Apr 9, 2015

Edit MattK: The display name is different when running PIE through the editor. This sort of inconsistency seems wrong. We should probably not ever be using the display name. Spaces are removed fro ...

Navigation System is gathering navigation bounds too early

UE - AI - Aug 6, 2015

In GameInstance.cpp when the Navigation System is created it calls... UNavigationSystem::InitializeForWorld This in turn ends up calling... GatherNavigationBounds(); This goes through all ...

Custom Time Dilation causes PhAT bodies to hover

UE - Simulation - Physics - Nov 5, 2015

Custom Time Dilation causes PhAT bodies to hover This is not only happening with vehicles like the original bug described. This is also happening with PhAT skeletal meshes that are moving. https:/ ...

Division by zero in FAnimNode_StrideWarping::EvaluateSkeletalControl_AnyThread

UE - Anim - Gameplay - Sep 29, 2025

When an Actor's CustomTimeDilation is 0.0, functions FActorTickFunction::ExecuteTick() and FActorComponentTickFunction::ExecuteTickHelper() will call AActor::TickActor() and UActorComponent::TickCom ...

DisplayName Metadata tag is not used in the SCS editor or the My Blueprints window

UE - Gameplay - Blueprint Editor - Nov 12, 2020

This also brings up a good point about how `FName::NameToDisplayString` works. Currently it will only remove a 'b' character if a boolean is given, which leads to inconsistent results throughout the ...