Unreal Engine Issues
Unreal Engine Issues
Camera tangent inversion on FBX Import when "Force Front XAxis" is enabled
UE - Anim - Sequencer - Mar 19, 2026When importing camera animation FBX files into Sequencer, enabling the "Force Front XAxis" option causes the key tangents for Rotation-Pitch (Y) to be inverted. This results in broken animation curv ...
Visibility track key value is no longer the inversion of the bound bHidden property
UE - Anim - Sequencer - May 13, 2026Regression introduced in UE 5.7. Works correctly in UE 5.6. Up to UE 5.6, the bool value written to the Visibility track's BoolCurve was the inversion of the underlying bound property (e.g. AActor: ...
Widget Components Add Thin Black Outlines to Images
UE - Editor - UI Systems - Dec 13, 2019When a slate element that uses a png with a transparency the edges have a black outline. When the Widget3DPassThrough material is applied to the widget the effect is lessened, but is the outline sti ...
Custom Mesh Component gives incorrect bounds
OLD - Anim - Jun 16, 2017Custom Mesh Component > Get Component Bounds gives incorrect bounds > Box Extent User Description: [4.16.1] Using "Get Component Bounds" on a Custom mesh component gives unusual numbers for the Bo ...
Adding a widget to a grid panel inside the grid panel tick can cause an out-of-bounds error
UE - Editor - UI Systems - Slate - Jan 25, 2021This is caused by adding an item to a grid panel inside the grid panel iteration loop. The same operation to canvas panel goes well without any errors. The difference is that the array iteration in ...
World Space Transparent Widgets Have Motion Blur
UE - Editor - UI Systems - Feb 24, 2020When a world space widget has their blend mode set to transparent they look blurry in motion. The effect is more pronounced when the camera rotates instead of when it is translated. Found in 4.24.2 ...
Sometimes CharacterMovement stops at very low steps (quite lower than Max Step Height).
UE - Gameplay - Player Movement - Jul 11, 2016Sometimes CharacterMovement stops at very low steps (quite lower than Max Step Height). Capsule radius of Character is 50cm, Max Step Height is 45cm, step heights is around 10~30cm, MaxWalkSpeed is ...
Inconsistent Behavior in TextureLODGroups when setting NumStreamedMips=0
UE - Rendering - Architecture - Jan 8, 2026A licensee has reported that it is not possible to disable texture streaming of a given TextureLODGroup by setting "NumStreamedMips=0" in their device profiles. Currently, using 0 results in the sam ...
AMD PSO creation causes hang in SceneCapture2D with Nanite + ShowOnly primitives
UE - Graphics Features - Nanite - Jan 16, 2024AMD RX 6800 XT driver appears to hang (or take a very long time) in the PSO creation of the FInstanceCullVSM_CS shader when using Nanite primitive filtering NOTES:Issue can be worked around by addi ...
[CrashReport] UE4Editor_Persona!FReferenceSkeleton::FindBoneIndex() [referenceskeleton.h:252]
OLD - Anim - Jul 20, 2017This is a common crash affecting users in 4.16, and has occurred since at least 4.14, affecting more than 200 unique users. Unfortunately none of them have provided any additional information. Sou ...