Unreal Engine Issues
Unreal Engine Issues
[CrashReport] UE4Editor_CoreUObject!FScriptArrayHelper::EmptyAndAddUninitializedValues() [unrealtype.h:2703]
UE - Gameplay - Blueprint Compiler - Aug 15, 2017This is a trending crash coming out of the 4.17.0 release. Based on user descriptions, this crash occurs on Play or Compile for affected users. User DescriptionsAgain crashing when I hit playIF I C ...
[CrashReport] UE4Editor_MeshPaint!FBaseMeshPaintGeometryAdapter::GetVertexPosition() [basemeshpaintgeometryadapter.cpp:70]
UE - Simulation - Physics - Character - Nov 2, 2017This is a trending crash coming out of 4.18, and may be a regression. Users have not provided any descriptions of their actions when the crash occurred. Source Context 57 const TArray<FVec ...
Find Collision UV Returning Unexpected Values
UE - Gameplay - Jan 19, 2017Find Collision UV is returning values that are above 1.0, when it is expected that these values would remain between 0 and 1. ...
UE5.6+ - Mutable - IDPrefix crash when combining Child Objects, Add to Mesh Component and Extend Mesh Section.
UE - Anim - Mutable - Jul 21, 2025So the issue seems to be a combination of Add To Mesh Component and Extend Mesh Section. I've tried this in Epic Launcher 5.6, 5.6 in-house modified engine as well as ue5-main 5.7 from git (editor ...
Buffer Visualization Overview is affected by EV
UE - Graphics Features - Mar 5, 2020EV -0.5 [Image Removed] EV 0.0 [Image Removed] ...
Custom expression additional outputs don't work when connected to World Position Offset
UE - Rendering - Architecture - Materials - Jun 24, 2026Custom expression additional outputs are considered (0,0,0) when connected to WPO. ...
Crash on garbage collection - Encountered 20 object(s) breaking GC Clusters assumptions.
UE - Foundation - Core - Aug 15, 2018Garbage collection crash during opening cinematic. Note after crashing and relaunching the game the saved file appears as 8% complete instead of 0%. Note this crash is also occurring with //UE4/D ...
Fracture Mode > "Remove-On-Break" setting: Cluster Crumbling causes flickering
UE - Runtime - Deformable - May 10, 2025Fracture Mode > "Remove-On-Break" setting: Cluster Crumbling causes flickering. Once the Remove-On-Break Cluster Crumbling effect is activated, there is a small delay between the disappearance of th ...
Crash when removing and re-adding instances to an InstancedStaticMeshComponent with PerInstanceCustomData.
UE - World Creation - Worldbuilding Tools - Jan 22, 2026When using an InstancedStaticMeshComponent with PerInstanceCustomData, the number of float elements in the "Custom Data" array should always be equal to NumCustomDataFloats multiplied by the number ...
FXmlFile fails to parse well-formed XML when it encounters a whitespace in an attribute
As title describes, the FXmlFile(const FString&) constructor fails to parse an XML that is as such: <?xml version = "1.0" ?> <parent name="aTag" link= "linkName"> <origin xyz="0.0000000000E+00 0. ...