Unreal Engine Issues
Unreal Engine Issues
Interface Message Nodes report an error if multiple inputs are connected to the Target pin.
UE - Gameplay - Blueprint Compiler - Feb 13, 2019Connecting multiple object pins as inputs to the Target input pin of an interface message node causes an error of the format:failed building connection with 'Replace existing input connections' Thi ...
Xcode 26/16.4 Metal Toolchain generates metallib's that are not compatible with iOS 16
UE - Platform - Apple - Sep 23, 2025Below is the error output from FirstPerson template as a C++ project: {+}../../../FirstPerson58CPP/Content/firstperson58cpp_sf_metal_es3_1_ios-metal_es3_1_ios.0.metallib, 5881486 bytes!2025-09-23 1 ...
Division by zero causing NaN/Inf on USkeletalMeshComponent::UpdateRigidBodyScaling() when setting scale to zero and back
UE - Simulation - Core - 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] ...
Geometry Collection (GC) fragments are affecting the Navmesh in wrong positions
UE - Simulation - Visual - Dec 6, 2024Geometry Collection (GC) fragments are affecting the Navmesh in wrong positions and the identified cause is wrong indexing. Once a GC breaks, it's fragments, when big enough, are creating islands in ...
Data loss when FPlane is implicitly converted to FVector4
UE - Foundation - Core - Jan 3, 2018The FSceneView::Deproject function calls FMatrix::TransformVector4 and passes an FPlane value. TransformVector4 takes in an FVector4 parameter, so the value being passed is implicitly converted to F ...
GetActorLocation and GetActorRotation have mixed up Tooltips
UE - Gameplay - Jun 4, 2018Within the declaration of the APlayerCameraManager class, the GetActorLocation and GetActorRotation functions have mixed up Tooltips Result: Tooltip says to use GetCameraRotation for the GetActorLo ...
World Context node returns inaccurately in PIE/Standalone
UE - Gameplay - Blueprint - Sep 11, 2017When a blueprint function library reaches a "World Context" node, the result returned by the node is invalid / null in Standalone mode. Additionally, the node will occasionally report as invalid in ...
Yellow 'reset to default' arrow will disappear if the Details panel scrolls it out of view
Tools - Jul 20, 2017Yellow 'reset to default' arrow will disappear if the Details panel scrolls it out of view. Aside from the Transform, this seems to happen for most values in the Details panel. User description: F ...
Split screen causes rendering issues with lightshafts
UE - Graphics Features - Feb 21, 2018There is an issue occurring where Split screen causes rendering issues with light shafts. This issue does not occur if you use the command " r.lightshaftquality 0" The issue no longer occurs. This i ...
Duplicating a blueprint that implements an interface and then removing that interface will cause compile errors that don't occur if the interface was removed from the original BP
UE - Gameplay - Blueprint Editor - Aug 1, 2020See steps to reproduce. Looks like the fixup when saying Yes to "Would you like to transfer the interface functions to be part of your blueprint" doesn't work correctly on the duplicated BP. Inter ...