Import then cancel while file is read leads to potential crash

TM - Interoperability - Oct 6, 2025

1/ Import a file with mootools such as an fbx 2/ while the file is still read, cancel the import Result : may crash few times after (when theoretically the file has finished being read) - not repr ...

Crash after setting a key on a Rotation Track, then trying to right click the key with Transform track collapsed

UE - Anim - Sequencer - Aug 3, 2016

Error message: Access violation - code c0000005 (first/second chance not available) Source Context: 336 337 if (bHasRotationKeys) 338 { 339 TSharedRef<FStru ...

Modified a mesh used as complex collision mesh does not affect the collision in the editor

UE - Editor - Feb 17, 2020

When a user changes any properties (for calling PostEditChangeProperty ) in parent static mesh or restarting the editor, the modified mesh is applied correctly. how to reproduce: [Link Removed] ...

Wind affects cloth in scene when there is no Wind Directional Source actor placed

UE - Simulation - Physics - Character - Jun 22, 2015

If a character with a cloth simulation or a mesh with a cloth simulation is in the scene there is wind force that is being applied to the cloth. The only way to remove this is by setting a Wind Dire ...

Huge game window when launching onto Safari 9.1.2

UE - Platform - Mobile - Aug 31, 2016

The game window in the Safari browser expands to a huge size along the Y axis. We do not see this issue on Safari version 10. The game window expands for about 5 minutes before the game is playab ...

Collision on rolling ball template floor incorrectly affects player character

Docs - Samples - May 27, 2015

In the rolling ball template, the new floor meshes cause the player character to jump when the player has not pressed any jump commands. It occurs more often if the players movement has been increas ...

r.Shadow.RadiusThreshold and r.Shadow.FadeResolution not affected by Scalability Settings

UE - Graphics Features - Apr 20, 2018

r.Shadow.FadeResolution and r.Shadow.RadiusThreshold values in DefaultScalability.ini are not being applied ...

Can Ever Affect Navigation does not detect updates to collision settings at runtime

UE - AI - Jan 27, 2016

When a mesh has its collision updated during runtime the navigation around the mesh does not update. Workaround: If the mesh is set to simulate physics then updates to its collision will update nav ...

Crash when launching 4.14.2 in cmd window with -dx12 argument

UE - Graphics Features - Jan 3, 2017

Launching the editor with DX12 from a command window is crashing the engine. Note Crash occurs on Nvidia version 376.19 and does not occur on 376.33 This is a Regression ...

Custom iOS icons don't appear using BP projects [4.18.2]

UE - Platform - Mobile - Dec 14, 2017

So far this has been tested on Mac deploying SunTemple to an iPhone 7 (10.3.3). It occurred with both Launch On and File Package. This does not occur when deploying StrategyGame from the same Mac t ...