Unreal Engine Issues

Crash when changing r.MaterialQualityLevel when FastGeo plugin enabled in cooked build

The engine crashes when the r.MaterialQualityLevel is changed in a cooked game that uses the FastGeo Streaming Plugin. The crash doesn't repro with the same steps in Editor, just in a cooked build. ...

RigVMRegistry : The registry is not locked for writing yet : ensure statement error during cook

I am seeing an cook failure at the very beginning. It goes away with a retry step via Horde. Please find attached call stack. I am able to consistently reproduce it by wiping all the DDC cache and ...

Duplicating SkeletalMesh in packaged game causes crash

This code worked until UE5.4. NaniteResource added in 5.5 causes this issue. ...

[AI] Crash when gathering heightfield geometry on worker thread

From the body of the ticket: We aim to do as much of the work off the game thread as possible to avoid impacting frame rate. We've recently found a crash during collection of the geometry slices fr ...

iPadOS AR App Crashes when ARKit's "Use Scene Depth for Occlusion" is Enabled

Does not crash in 5.4 on same hardware so looks like a regression. Attached Unreal logs indicate source of critical error: 'FARKitCameraOverlayMobilePS' shader uniform expression set mismatched sh ...

LIVE: EDITOR: MATERIALS: CRASH: Setting the MipValueMode for MipLevel or MipBias to 4 or higher will crash the editor

BRANCH: MAIN CHANGELIST: 2322258 PLATFORM: Windows DESCRIPTION: When using a texture sample with the MipValueMode to MipLevel or MipBias with a value of 4 or higher will cause a crash. ...

WP HLOD Crash on Small Cell Sizes

Ensures in ChaosExamples_fracture map in ChaosDestructionDemo

Ensures trigger when playing in the ChaosExamples_fracture map in the ChaosDestructionDemo project. The ensures seem to happen during different parts. A couple occurrences were when I triggered th ...

Spline Mesh regression on older iOS phone

Regression with rendering Spline Mesh Components seen on older (5s) iOS device. I did not reproduce a crash with an iPadPro A1701 or an Android Note 4 Confirmed in 4.23 MAIN at CL 6910902 ...

Crash on setting Max. Texture Size with Non Power of 2 Texture

Also Reproduced in Main Promotable-CL-2479729 After importing and saving a texture which is non power of 2 and not an hdr texture, when you set the Maximum Texture Size in the Texture Editor's Comp ...