Client Receives Incorrect Parent on Server Detachment if AttachParent Is Null

UE - Networking - Apr 6, 2017

User Description: In USceneComponent::PreNetReceive the old (in this case, non-null) AttachParent is being cached into NetOldAttachParent. In USceneComponent::PostRepNotifies, AttachParent and NetO ...

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

UE - Platform - Mobile - Jul 24, 2017

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

Can't set Event replication settings when delegate output pin is connected

UE - Gameplay - Blueprint Editor - Feb 19, 2018

User Reported Bug Replication Settings no longer editable after event delegate is connected. Doesn't seem to affect functionality, only UI. (replication settings stay as set before plugging delega ...

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

UE - Graphics Features - Mar 20, 2018

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

Windows registers touch events twice - Once as mouse click

UE - Editor - UI Systems - Slate - Nov 28, 2017

When tapping on a button with a touch monitor, it is registered as two inputs. There was an issue on win7 where touch inputs were counted as touches and clicks. This seems to be the same issue on wi ...

Template_Default.umap and Template_Default_BuiltData.uasset will be changed each time after cook.

UE - Foundation - Core - Cooker - May 10, 2018

Each time after cook the Template_Default.umap or Template_Default_BuiltData.uasset are changed. But if I move Template_Default.umap to the project content folder, they will be the same as the las ...

Stereo layer appears to move when used with the Oculus Rift

UE - Platform - XR - May 17, 2018

Stereo layer appears to move/slide as the player moves the HMD from side to side when using the world locked setting for the stereo layer. ...

All folders in the World outliner open up when Playing in editor with multiple players

Tools - May 24, 2018

When playing in the editor with multiple players, the folders in the world outliner open up. ...

Crash occur package application which set the StringTable

UE - Foundation - Core - Mar 14, 2019

Crash occur the packaging application which has the title referencing StringTablem. When lunch the application with editor and standalone, it's not crash. It' not occur 4.20, and crash with 4.21 and ...

Python cannot spawn object when running in Ueditor-CMD

UE - Editor - Workflow Systems - Dec 7, 2018

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 ...