Unreal Engine Issues

Navmesh rebuild always occurs on Startup map immediately after starting editor

Whenever launching the UE5 Editor, it rebuilds the navmesh on the first map it opens. Reopening the same map again will not cause the navmesh to be rebuilt. It seems that the first time the map is o ...

iOS launch screen might briefly appear in Portrait before switching to Landscape

Sometimes on the first launch of the game after install, the launch image will be a cropped portrait drawn in landscape orientation, on the left side of the screen, with the top and bottom getting c ...

Evaluation of attributes in a slot with time blend profiles that has additive poses is not as expected

EnhancedEditorInput.bAutomaticallyStartConsumingInput editor setting resets to false on editor startup.

The editor setting for automatically start consuming input can be set to enabled as a boolean, but whenever the editor restarts this value is reset to false. ...

Crashes when applying material on objects after changing UV mapping parameters with Lumen enabled.

Info from the user: "This is super basic, only just started to build the scene. I have modeled in Vectorworks 2024 Architect and imported it into Twinmotion via the export and not the live link. The ...

Small UInstancedStaticMeshComponent::UpdateInstanceTransformById bug

The call to UpdateInstanceTransform within UInstancedStaticMeshComponent::UpdateInstanceTransformById(..) sends bTeleport in place of bMarkRenderStateDirty that was added as part of Unreal Engine 5. ...

Editor preview window for CurveLinearColorAtlas does not automatically update when their CurveLinearColor asset is changed

When the CurveLinearColor asset assigned to a CurveLinearColorAtlas is edited (e.g. change the colors of the gradient), the preview window of CurveLinearColorAtlas editor does not automatically upda ...

SetActorLabel() is slow on Landscapes

I've noticed calling SetActorLabel() on a Landscape will call PostEditPropertyChanged() which causes the Landscape Components to regenerate all collisions. As per the repro, this can take a long tim ...

Open a level that contains instanced meshes (with built lighting) will crash the editor

Open a level that contains instanced meshes will crash the editor. Per the users description, the level must have had lighting built and then another level loaded or the editor restarted. Once the ...

Editing multiple Math Expressions will crash the editor

Editing multiple Math Expressions will crash the editor. ...