Unreal Engine Issues
Unreal Engine Issues
Crash Occurs When One Morph Target is Deleted and Another is Adjusted Afterward
UE - Graphics Features - Feb 26, 2018Engine crashes when a morph target on an asset that has multiple morph targets is deleted and then another morph is adjusted afterwards Notes: Asset came from an older Jira where this same issue o ...
Crash launching project with Compat.MAX_GPUSKIN_BONES=75 and Preview Rendering set to Shader Model 5
UE - Graphics Features - Oct 18, 2018Crash occurs when the user launches a project with a +75 bone skeletal mesh actor in their scene with the Compat.MAX_GPUSKIN_BONES=75 config change, and the default preview render is Shader Model 5. ...
Crash: Device Lost after enabling SM6 within EngineTest and QAGame
UE - Rendering - Architecture - RHI - Apr 12, 2022This is marked as a regression as the option to set SM6 within the project setting is new.Testing on NVIDIA as we speak Issue with the same repro steps is not an issue on an NVIDIA 3000 series card ...
Opening a USD actor BP will crash if an instance of the USD actor's sequence is open
UE - Editor - Content Pipeline - USD - Apr 13, 2022Opening the USD blueprint with its sequence open will crash the editor. ...
Sky Atmosphere Material Nodes not Correctly Represented in the Surface Cache for Nanite Enabled Static Meshes
UE - Graphics Features - Apr 1, 2025When nanite is enabled on a static mesh, lighting contributions from Sky Atmosphere material nodes are not incident on the static mesh and no longer present in the overall lighting of the scene. Th ...
Ensure condition failed opening UnrealTournamentEditor with force all skinned meshes to recompute tangents enabled
UE - Graphics Features - Apr 4, 2017I believe I had the "force all skinned meshes to recompute tangents (also forces Compute SkinCache)" turned on for a verification at one point, and left it on. I have experienced some ensures and ot ...
[Audio Analysis][Ensure] - Sound Submix Spectral Analyzer Delegate Throws Ensure when Analysis Started Before the Delegate is Added
UE - Audio - Nov 25, 2021Hit the following Ensure when trying to use the Spectrum Analyser. Also hit this in 4.26 so it doesn't appear to be a regression. Occurs with any of the following Band Settings or when creating you ...
Crash when enabling Nanite on a Mesh using an OptimusDeformer
UE - Anim - Rigging - Deformer - Jan 29, 2026When a skeletal mesh has a deformer present and then nanite support is enabled and applied. (the deformer in question was hsasset://DeformerGraph/Deformers/DG_LinearBlendSkin_Morph_Cloth_RecomputeNo ...
Variant manager crash in UPropertyValue::HasValidResolve
UE - Editor - Content Pipeline - Variants - Nov 21, 2024in the past we have reported a lot of VM related bugs which got fixed over time. Unfortunately, I think we have another one. Right now we're using 5.0.3 binaries from the launcher. Now the pro ...
Crashes when applying material on objects after changing UV mapping parameters with Lumen enabled.
TM - Core - Jun 20, 2024Info from the user: "This is super basic, only just started to build the scene. I have modeled in Vectorworks 2024 Architect and imported it into Twinmotion via the export and not the live link. The ...