Editor Crashing on Details Panel when Calling ForceRefresh

Tools - May 30, 2018

Editing bool of the nested child CrashableDataAsset causes crash. Expected: CrashableDataAsset children are properly assigned. Result: Engine crash ...

BP timelines: when converting internal curve to external, the external curve isn't used until BP is recompiled

UE - Gameplay - Blueprint Editor - Aug 28, 2023

Blueprint timelines: when converting an internal curve to an external curve asset, the curve asset's data isn't used until the blueprint is recompiled. This is confusing as there is no indication th ...

Tilemaps with masked materials respond to lighting at incorrect directions

UE - Gameplay - Paper2D - Nov 19, 2018

Tilemaps using lit methods of rendering are subject to strange lighting behavior. If the material for the tilemap is using a 'masked' method of rendering.  Lighting will appear at incorrect angles. ...

[AI] WP Dynamic navmesh fails to rebuild tiles with actors that are loaded but not part of the base navmesh.

UE - AI - Navigation - Feb 18, 2025

WP dynamic navmesh does not properly react to actors or navigation modifiers that are loaded in areas that the navmesh has not yet streamed into. Although the actors/modifiers are not part of the ba ...

Ragdoll replication on server side is not replicated correctly on client

UE - Networking - Dec 2, 2014

Ragdoll replication on server side is not replicated correctly on client. The client will see the server players ragdoll dissappear and reappear at the 0,0,0 origin point. AnswerHub Posts: https: ...

Project packaged on Windows for Linux crashes after exiting on Linux

Tools - Aug 18, 2016

I noticed this after packaging multiple samples projects on Windows for Linux and running them on my Linux machine. The project exited cleanly, but there was a crash and callstack generated in the ...

Editor crashes after redoing the addition of a component to a static mesh actor

Tools - May 30, 2017

This is not a regression. This also occurs dating back to 4.15 and 4.14. The editor crashes on this check in FLevelEditorActionCallbacks::Paste_CanExecute() when updating the Edit menu state: chec ...

Option "Use Mouse for Touch" does not work correctly when running the game in "Standalone" or "New Editor Window (PIE)" modes: Virtual joystick does not appear and mouse cursor is incorrectly hidden while captured.

UE - Gameplay - Input - Apr 1, 2025

The Editor provides option "Project Settings – Engine – Input – Mouse Properties – Advanced – Use Mouse for Touch" to allow testing virtual joysticks and other touch controls with the mouse. When ru ...

Crash in Retarget Manager with Humanoid Rig when trying to re-assign a bone to a node

OLD - Anim - May 26, 2015

Crash in the Retarget Manager with Humanoid Rig when trying to re-assign a bone to a node. Happens particularly when there is already a bone selected and you want to select a new one. [Link Remove ...

Delta struct serialized fast arrays replicating new elements with no changelist

UE - Networking - Jun 14, 2021

There is a scenario where delta struct serialized fast arrays can replicate changes that introduce additional elements to the array, but without changelists containing the new data. This needs furt ...