Unreal Engine Issues
Unreal Engine Issues
[AI] Area Class to Replace does not work on SplineNavModifierComponent
UE - AI - Navigation - 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 ...
Drag-and-drop any cooked Blueprint class asset into the level viewport crashes the editor
UE - Framework - Blueprint - Jul 14, 2025Dragging any cooked Actor-based Blueprint class asset into the level editor viewport will crash the editor when it has been configured to work with cooked assets. This is a regression that started ...
Dataless Mutable: Cloth Simulation Not Working With Skeletal Mesh Parameter Node?
UE - Anim - Mutable - Nov 25, 2025Testing the new dataless Mutable workflow in Unreal Engine 5.7. When replacing the old Skeletal Mesh node with the new Skeletal Mesh Parameter node, the cloth simulation stops working. ...
Crash on FDeferredShadingSceneRenderer & FTranslucentPrimSet with Dynamic Directional and Lit Translucent FX
UE - Graphics Features - Nov 11, 2015User reporting crash with a specific setup using Lit Translucent FX Clouds and a Day-Night Setup running on a Timeline from Level Blueprint. [Link Removed] 4.8 BUGG: [Link Removed] 4.9 BUGG: [Li ...
Crash with a migrated BP actor using InstancedStaticMeshComponent
UE - Gameplay - Blueprint - Nov 28, 2016A licensee reported one of their map crashes on open when they tried to migrate from 4.12 to 4.14. There was no crash in 4.13. This seems to be caused by a certain BP actor that adds InstancedStat ...
D3D HUNG crash - FD3D11DynamicRHI::RHIReadSurfaceFloatData()
UE - Graphics Features - Jan 18, 2017This is one of the widespread D3D Hung crashes that have existed since 4.14. This particular callstack has affected around 300 users. The issue has been successfully reproduced on a home PC. Dxdi ...
Text block Outline cropped out at large sizes
UE - Editor - UI Systems - Mar 8, 2017Text block Outline cropped out at large sizes. This affects Grid Panels and was additionally tested with Horizontal boxes with the same result Regression: This issue does not occur in 4.14.3 Binary ...
Per-section shadow/collision flags lost when merging actors
OLD - Anim - Mar 24, 2017Information loss when merging actors such as cast shadow and collision. If one of the actors being merged has a different setting such as not casting shadows. This information will be lost and repla ...
High bandwidth usage on listen servers, even with bare minimum replication
UE - Networking - Mar 1, 2019UDN user claims that in an empty level, when using a listen server, bandwidth is higher than expected - ~5.5KB/sec for two connections, and appears to be framerate dependent. Has posted screenshots ...
Some blueprint nodes are noticeably wider
UE - Gameplay - Blueprint Editor - Feb 19, 2021Certain blueprint nodes are noticeably wider than they were in 4.25, and seem to get excessively wide if the user fills in literal pins on them. This was noticed with the Array Add nodes, but may a ...