Unreal Engine Issues
Unreal Engine Issues
UNetDriver server-side hitch results in ActorInfo->NextUpdateTime far into future
UE - Networking - Feb 16, 2024A high UWorld::Tick DeltaSeconds (i.e. GameThread hitch) results in a high UNetDriver::TickFlush DeltaSeconds. This DeltaSeconds can high (many seconds) if the hitch is long. This value then affects ...
Niagara - When Interpolated Spawning is disabled, the first frame of each particle unexpectedly does not take into account the Particle Update stage
UE - Niagara - Feb 28, 2025Foreword: Even if the behavior described here is by design, it is rarely (if ever) expected or desired. This was discussed and agreed to be treated as a bug. Explanation below. When interpolated sp ...
Blueprint with Niagara System and Skeletal Mesh Components Automatically Updates Niagara System Skeletal Mesh
UE - Niagara - Apr 4, 2019When adding a niagara system that reproduces a skeletal mesh and a skeletal mesh as components to a blueprint, the niagara system immediately updates its skeletal mesh to the most recently updated s ...
Shader compiler errors when using enclosed local variables in a material while ray tracing is enabled
UE - Rendering Architecture - RHI - Jan 23, 2020A licensee is seeing an issue with a couple of post process materials after enabling ray tracing. While the materials presenting the issue fail to compile for different reasons, they both refernce t ...
Memory leak when Lumen is disabled but r.MeshCardRepresentation=1
UE - Graphics Features - Lumen - Jul 29, 2024When Lumen is disabled, but the cvar "r.MeshCardRepresentation" is set to 1, Lumen will continuously enqueue object removal from the Lumen Scene, without ever emptying the array of primitives to rem ...
Attempting to set skeletal mesh on vehicle blueprint during PIE crashes editor
UE - Simulation - Physics - Feb 8, 2016Switching the skeletal mesh of an actor during PIE crashes the editor. Frequency: 5/5 Crashreporter: N/A ...
Project crashes when exiting mobile preview
UE - Gameplay - May 27, 2015User project crashes when exiting from mobile preview. Frequency: 5/5 Crashreporter: [Link Removed] ...
Spline Mesh regression on older iOS phone
UE - Platform - Mobile - Jun 10, 2019Regression 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 ...
Server travel from Shooter Game level Highrise crashes editor
UE - Networking - Nov 17, 2014If a person is on the Shooter Game level Highrse and uses the blueprint node "Execute Console Command" to server travel to any other level the editor will crash. In PIE mode the editor will hang at ...
Unreal Editor Submenus Disappear on Mouse Hover on Linux during Remote Session
UE - Editor - Applied Usability - May 8, 2025Sub-menus disappear when using Linux in a remote session in launcher build of UE Release 5.5.4. ...