Unreal Engine Issues
Unreal Engine Issues
Vector VM - Crash / memory stomp when using > 255 external function calls
UE - Niagara - Aug 12, 2025The Vector VM has only every supported a byte's worth of external function calls, when we blew the limit it would index into the incorrect VM call. The new VM will also overwrite memory when exceed ...
GAS: Double attributes not shown GameplayDebugger
UE - Gameplay - Gameplay Ability System - Aug 27, 2025Context The Gameplay Ability System lets devs specify numerical attribute properties in UAttributeSet subclasses. Although the preferred attribute property type is FGameplayAttributeData, GAS has l ...
Exposed Niagara User Parameter Enums are displayed as Integers
UE - Niagara - Sep 29, 2022(Note: all enums seem to fail when exposed as a user parameter and changing the exposed int does not impact the result of the simulation) Add a rigid mesh collision query di to a scratch module pe ...
Ctrl+Alt selection drag inside to outside of Matinee window will crash the editor
Tools - May 18, 2016Ctrl+Alt selection drag inside to outside of Matinee window will crash the editor Reproduced in Releases stream 2982080 as well, to verify that this wasn't the same bug as https://jira.ol.epicgames ...
World Partition Editor minimap build failed
UE - World Creation - Worldbuilding Tools - Aug 10, 2023The issue was reproduced when building a minimap for an open world level with no Actors with "Is Spatially Loaded" enabled. Placing additional Actors with "Is Spatially Loaded" enabled in the level ...
Plugin Warden entitlement check "timing out" error
UE - Editor - Content Pipeline - Datasmith - Importer - Dec 28, 2017A growing number of users are reporting the Plugin Warden entitlement check timeout error while attempting to import datasmith files. Some users have been able to resolve the issue, some have not. ...
GetMonitorSizeFromEDID may fail to acquire the native resolution for ultrawide monitors
UE - Foundation - Dec 20, 2023For some ultrawide monitors, UE may not correctly fetch the native resolution. GetMonitorSizeFromEDID attempts to retrieve native resolution from the Detailed Timing Descriptor of the EDID, but thes ...
Granular Synth stays silent since it cannot load the sound with Stream Caching enabled
UE - Audio - Jun 1, 2020Using Granular Synth with Stream Cache enabled, Granular Synth will stay silent since it cannot load the sound with Stream Caching turned on. This was reported and tested in 4.25 (CL-13144385). Thi ...
[CrashReport] UE4Editor_D3D11RHI!FD3D11DynamicRHI::RHICreateUniformBuffer() [d3d11uniformbuffer.cpp:218]
UE - Graphics Features - Jun 12, 2018No user comments in crash group 208 check(Layout.ResourceOffsets.Num() == NumResources); 209 210 for (int32 i = 0; i < NumResources; ++i) 211 { 212 ...
Crash when exposing a TOptional<FName> or TOptional<FText> to the editor through a UProperty.
UE - Editor - Workflow Systems - Mar 25, 2025Support for editor-exposed uproperties of type TOptional<T> has been added by CL 28199740 on september 2023. However, since then until today in UE 5.5, a crash can happen when exposing TOptional<FNa ...