Unreal Engine Issues
Unreal Engine Issues
Crash when attempting to change the parent of a material instance constant through editor scripting
UE - Rendering Architecture - Materials - Apr 9, 2025The built-in class "UMaterialEditingLibrary" provides various editor scripting functions related to creating and editing materials and material instances. One of these functions, UMaterialEditingLib ...
Metal crash after painting 300 Foliage meshes onto a surface
UE - Graphics Features - Oct 4, 2017Encountered a Metal crash when painting Foliage on Mac. I'm unable to reproduce anything similar on Windows. This crash can occur if the user drags a Static Mesh into the Foliage Panel or uses an e ...
Crash when FVolumetricRenderTargetViewStateData::Mode is not properly initialized
UE - Graphics Features - Jan 15, 2025A licensee has reported that occasionally a race condition triggers a crash during the initialization of FVolumetricRenderTargetViewStateData. If FVolumetricRenderTargetViewStateData::Mode is not pr ...
[CrashReport] Deleting pins on Switch on Gameplay Tag Container node can cause a crash
UE - Gameplay - Blueprint Editor - Mar 15, 2017When adding/removing pins on a Switch on Gameplay Tag Container node, it can cause a crash. There are multiple ways to get this to happen when deleting pins, the order given in the reproduction step ...
Application crashes when blueprint contains a copied timeline
UE - Gameplay - Blueprint - Oct 15, 2015Copied timeline nodes triggers an Android crash and a black screen on the iOS devices. ...
Crash when viewing Lightmap Density mode and with Vert
UE - Graphics Features - Oct 15, 2015If the option in Project Settings for Accurate Velocities from Vertex Deformation is enabled and then using the View Mode for Lightmap Density you will get a hard crash. ...
Python crash the engine at exit.
UE - Editor - Workflow Systems - Oct 25, 2022A UDN reported various crashes at exit in the embedded Python library. I was able to repro the issue in Release-5.1 and trace it back at the point where python runs its garbage collection in Py_Fina ...
Crash Clicking on Enum in BT Decorators After the Enum Has Been Altered
UE - AI - Apr 5, 2017Clicking on a Behavior Tree decorator that references an Enum blackboard key will crash the editor if that Enum has been altered in the method described in the repro steps. If you set decorators to ...
Using Attach To in Construction Script Causes the Editor to Crash
UE - Gameplay - Blueprint - Nov 17, 2015After creating a blueprint with a box trigger and a cube component, attempting to use an AttachTo (Box) node and then attaching the cube to the In Parent socket compiles without issue. However, if y ...
The DemoRec console command crashes the editor if used during PIE
UE - Networking - Aug 5, 2015The DemoRec console command crashes the editor if used during PIE. Reproduced in 4.9 Preview 2 binary and 4.9 Releases (//depot/UE4-Releases/4.9/Promotable-CL-2643093). Does NOT occur in 4.8.3 bina ...