Unreal Engine Issues

Accessed None for Sequence Actor references in project upgraded to 4.17

In a project upgraded from 4.16 to 4.17, the level sequence doesn't play on first PIE and returns Accessed None errors. Next time you PIE, it plays fine. This now happens every time you re-open th ...

UPL addElement and addElements can infinitely recurse if tag is included in inserted data

Inserting element data which contains the same tag as to insert into can create an infinite loop of adding the element to itself. ...

[CrashReport] UE4Editor_Engine!FStaticMeshVertexBuffer::BindLightMapVertexBuffer() [staticmeshvertexbuffer.cpp:495]

User comment from crash group:reimporting fbx 491 void FStaticMeshVertexBuffer::BindLightMapVertexBuffer(const FVertexFactory* VertexFactory, FStaticMeshDataType& Data, int LightMapCoordinate ...

Blueprints with accent characters fail to open when converted from 4.19 to 4.20

Any Blueprint with accents in the name, coming from 4.19 won't open in 4.20. Double clicking the asset, trying to right click asset, results in no actions. When loading the project this message app ...

Python cannot spawn object when running in Ueditor-CMD

It is probably link to the fact the function try to access so GUI object that are not accessible in CMD EditorLevelLibrary.spawn_actor_from_object should work in commandlet ...

FP_FirstPerson and FP_FirstPersonBP missing when adding feature packs

When adding the first person template (bp or code) as a feature pack, an error occurs stating "Unable to read file" and a warning "failed to import".  ...

Map Get Node Pins In Niagara Module Scripts Can't Search For Standard Data Types

This wasn't like this in 4.24 (see attached images). If you create a variable Engine.Owner.Position the search will find it however. Found in 4.25 Preview 2. Reproduced in 4.26 Main. ...

Crash on loading level with Landscape by 2 PIE instances

IAnimationDataController::Evaluate implementations do not account for compatible skeletons

Looks like we are missing code in the Evaluate methods similar to what we are doing in  DecompressPose to account for compatible skeletons.  The easiest way to repro is in a standalone game because ...

PCG causes crash when UGrassInstancedStaticMeshComponent is set as a mesh entry for the static mesh spawner node

PCG causes crash when UGrassInstancedStaticMeshComponent is set as a mesh entry for the static mesh spawner node. ...