Unreal Engine Issues
Unreal Engine Issues
Widget that is a derived from a child widget reports component variables as Invalid
UE - AI Workflows - UI Systems - Aug 23, 2023This is not a regression. Tested in //UE5/Release-5.2 CL26001984 A widget that is a derived from a child widget reports component variables as Invalid, while the child and parent of that child will ...
[AI] Area Class to Replace does not work on SplineNavModifierComponent
UE - Runtime - Character - Jun 16, 2025The SplineNavModifierComponent does not have the same behavior as regular nav modifier components where the modifier can specify that it only replaces a given NavArea class. Setting the area class t ...
Chaos Cloth - Multiple issues with convex colliders
UE - Runtime - Deformable - Feb 6, 2026Issue 1: Convex Collision Transformation Missing for External Collision Sources Issue 2: Convex CCD Stability Issues due to Plane Intersection Semantics See attached URL for more details. ...
Crash on PIE exit after dynamically enabling and disabling tick functions through the Level Script blueprint.
UE - Gameplay - Mar 23, 2018User reports hitting an assertion due to invalid FTickTaskManager state when game is attempting to unregister a tick function that was previously disabled dynamically. Failed assertion is in FTickT ...
Division by zero causing NaN/Inf on USkeletalMeshComponent::UpdateRigidBodyScaling() when setting scale to zero and back
UE - Runtime - Simulation - Feb 11, 2026Up to UE 5.5, skeletal mesh physics did not get updated when the component's scale changed. This was improved on January 2025 with CL 39190335, which addressed [Link Removed] ...
Compile error when declaring UPROPERTY() TArray with TFixedAllocator
UE - Foundation - Core - Feb 20, 2015Declaring a UPROPERTY() TArray with TFixedAllocator fails to compile. Output log states "Missing '>' in 'tarray'." Removing/commenting out the UPROPERTY() allows the project to compile correctly. ...
Anim BP Class Defaults are deselected on compile
OLD - Anim - Nov 9, 2016If the Class Defaults are selected when compiling an animation blueprint, the will be deselected and the user will be required to select them again. This doesn't occur with anim blueprint nodes. A ...
Collapse All/Expand All not functioning as expected
Tools - Nov 2, 2016This is only happening in the Editor Preferences/Project Settings. Hitting the Collapse All option removes everything and leaves the window blank where all of the settings were. Expand all brings th ...
Investigate intermittent crash in CacheOptimizeIndexBuffer on Editor startup on Linux
UE - Platform - Linux - Nov 23, 2015Building 4.10 from the GitHub release branch on Linux fails to open after install and instead crashes Community Suggested Fix: Switching triangle order optimization off with r.TriangleOrderOptimiza ...
Precomputed AO Masks cannot be used to LERP between Normal Maps
UE - Graphics Features - Sep 18, 2015When using the Precomputed AO Map node to LERP between 2 Normals, only the A input into LERP will render out on the mesh. The Precomputed AO will work fine for Base Color LERPs Example: [Image Re ...