Unreal Engine Issues
Unreal Engine Issues
ApplyRootMotion**** ability tasks broadcast completion events before calling EndTask
UE - Gameplay - Gameplay Ability System - Mar 22, 2023Several ability tasks used to apply root motion sources on Characters have ordering problems between on-completion style events and ::EndTask / OnDestroy. UAbilityTask_ApplyRootMotionMoveToForce is ...
Light as If Static setting does not Persist when Re-opening Project
Tools - Apr 28, 2016This bug was originally entered back in 4.8 as [Link Removed], but was closed as by design. The reason was, the mesh did not have Lightmap UVs, so using the 'Light as If Static' option would not wor ...
Packaging Error When Setting Recast Nav Mesh Runtime Generation
UE - AI - Jan 25, 2016Setting the Runtime Generation on the Recast Nav Mesh to a different preset than what is set in the Project Settings causes an error to appear upon trying to package the project, and causes the pack ...
Multiple setter functions in UMaterialEditingLibrary always return false even when the parameter is correctly set on the MaterialInstance.
UE - Rendering - Architecture - Materials - May 30, 2025In Unreal Engine, materials can expose parameters that can then be modified via instances (MaterialInstanceConstant). The UMaterialEditingLibrary provides several functions to modify these parameter ...
UMG Retainer Box renders incorrect colors with Color Vision Deficiency enabled
UE - AI Workflows - UI Systems - UMG - Aug 27, 2025When using a Retainer Box in UMG with Color Vision Deficiency enabled, the content inside the Retainer Box is rendered with incorrect colors compared to the rest of the UI. This bug is present in UE ...
FNotifyNodeInterface crashes when referenced Notify is invalid
UE - Runtime - Animation - Mar 1, 2024Currently FNotifyNodeInterface directly references notifies that live within the related anim sequence. This can cause intermittent crashes when notifies are removed as the UI can still reference t ...
Project configured to spawn Niagara system via Character blueprint in a Code project fails to Cook, then crashes project on open
UE - Niagara - Mar 7, 2019Project configured to spawn Niagara system via Character blueprint in a Code project fails to Cook, then crashes project on open Discovered when verifying [Link Removed] (also similar to [Link Remo ...
[CrashReport] UE4Editor_MovieSceneTools!FPropertySection::GetPropertyValue<float>() [propertysection.h:70]
UE - Anim - Sequencer - Sep 20, 2017This is a somewhat common crash in 4.17. Users have not provided any descriptions of their actions when the crash occurred. Source Context 58 /** Gets the current value of the property w ...
Nativized BP Struct dependency can lead to a fatal loader stall
UE - Gameplay - Blueprint Runtime - Mar 7, 2018Report of a chain of dependencies that can lead to a fatal loader stall in a nativized build:Thing -> BPStruct2BPStruct1 -> BPStruct2 The necessary order of operations is:BPStruct1 loadsBPStruct2 l ...
Inherited Skeletal Mesh Components do not work for Mapping Control Rig Component
UE - Anim - Rigging - Control Rig - Oct 12, 2020Control Rig Component does not work with inhereited Skeletal Mesh Components. They only work with non inhereited Skeletal Mesh Components. [Link Removed] ...