Unreal Engine Issues
Unreal Engine Issues
TBaseBlendedCurve::ConvertToAdditive adds a curve track to an additive when the curve only exists in the base pose
UE - Anim - Runtime - May 29, 2023When we create curves on additive animations, we are creating a curve based on whether the curve exists in either the base or additive pose. This wouldn't be the expected behaviour for a user when ...
tvOS crash on startup with Shared Material Shader Code enabled
UE - Platform - Mobile - Jul 9, 2019Enabling Shared Material Shader Code will cause a crash on tvOS From user: "We originally enabled Share Material Shader Code long before trying a tvOS build, making this crash tricky to debug. W ...
Child actor passes a string to it's parent's overloaded constructor the incorrect string is received
UE - Gameplay - Sep 24, 2019When a child actor passes a string to it's parent's overloaded constructor using an overridden function that returns a string it won't receive the correct string. I have verified that the correct fu ...
Packed level actors and Level instances are sometimes not included in HLOD build on a World Partition Level
UE - World Creation - Worldbuilding Tools - HLOD - Mar 14, 2025Context World Partition - Hierarchical Level of Detail (HLOD) system uses custom HLOD Layers to organize large amounts of Static Mesh Actors and generate a single proxy mesh and Material. Problem T ...
When importing static mesh using interchange and collision is generated, the asset does not have Collision Generated set to true
UE - Editor - Content Pipeline - Import and Export - May 19, 2025Context: The Interchange Framework is Unreal Engine's import and export framework. When importing a mesh without collision, collision can be auto-generated. Problem: The problem is when importing s ...
Editing static functions in Blueprint Function Libraries with hotreload can cause saving issues with blueprints calling them
UE - Gameplay - Blueprint - Sep 26, 2016When editing a Static function from a Blueprint Function Library, any blueprints that have already had it added are unable to be saved. This can be worked around by removing the node and adding it a ...
[CrashReport] Assertion failed: OLEReferenceCount == 0 in UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindows_Private()
UE - Editor - UI Systems - Slate - Aug 22, 2017This is a regular and longstanding crash in 4.17 that has occurred since at least 4.14. Users have not provided any descriptions of their actions when the crash occurred. There has been some previo ...
iOS Show External Login UI Blueprint Node fails on new iOS devices
UE - Online - Jun 6, 2019I have been trying to test iOS online subsystem functionality for my game and thought that this blueprint node was just broken. This bug will probably catch many UE4 developers that are new to iOS b ...
Static Mesh imported from USD file has empty UV channel
UE - Editor - Content Pipeline - Import and Export - Oct 6, 2020When importing static mesh from USD file then it has the wrong amount of UV channels. Selecting a UV channel shows an empty area in the viewport. Regression: YES - not reproduced in 4.25.3 produc ...
Forward Rendering causes Volumetric Material to not render against background
UE - Graphics Features - Nov 15, 2022Regression: Tested in UE5/Release-5.0, and the issue is reproduceable. This issue appears to occur when the SkySphere is deleted from the level, as leaving the SkySphere in the level causes the Vol ...