Adding pin to CR node causes crash if input variable is assigned to one of the array element

UE - Anim - Rigging - Control Rig - Aug 22, 2025

When a node has a variable assigned to one of its pins. You will get a crash every time you add a pin. I am sure this goes for all nodes with with the "add pin" functionality [Link Removed] ...

A Simulating Physics component with StartAwake = false will be awoken by a Welded component

UE - Simulation - Physics - Jan 10, 2025

A Simulating Physics component with StartAwake = false will be awoken by a Welded component If a welding occurs during the call to OnCreatePhysicsState, this breaks the start awake disabled flag. Th ...

Deploying from Windows to Linux fails on the first attempt

UE - Platform - Linux - Aug 3, 2017

After hitting this failure, if you try to deploy again, then it will work. This only occurs on the first attempt. Initially, I thought I hit a disc space issue I was hitting due to having a sample ...

Actor ClassID Value Read From Data Table only in PIE

UE - Gameplay - Blueprint - Sep 22, 2016

When accessing a data table in BP and getting an Actor Class from it the Class will return NULL when in Standalone Game, Launching, or in a packaged game. This only seems to work in PIE. ...

Draw as border is completely opaque when size in negative

UE - Editor - UI Systems - Feb 26, 2019

When an image widget is set to draw as border it will no longer render as a border if the size is negative. The widget appears completely opaque. ...

GetAllMobileRelevantLayerNames drops those layers which are only connected to RuntimeVirtualTextureOutput Node

UE - Graphics Features - May 6, 2021

in UMaterial::GetAllReferencedExpressions, the mobile branch ignores every CustomOutputExpressions including RuntimeVirtualTextureOutput. ...

Ensure after reparenting Blueprint and moving a property to the new parent

UE - Gameplay - Blueprint Editor - Jul 20, 2023

Moving a property from a recently reparented BP to its new parent will assert in  FBlueprintCompileReinstancer::MoveDependentSkelToReinst at  ensure(PrevStructSize == NewStructSize) This only see ...

FBX import freezes in DataPrep

UE - Editor - Content Pipeline - Visual Dataprep - Mar 3, 2025

FBX file import freezes UE while trying to import into DataPrep by the Interchange importer. The import will start, but then a message will pop up stating "Creating snapshot of world content ... " ...

Unreal Editor can get in an infinite while loop when checking the History of an asset under Perforce.

UE - Editor - Workflow Systems - Oct 21, 2024

Unreal Editor can get in an infinite while loop when the action Asset->Source Control->History is used in a Blueprint Asset. Reportedly, this issue is only encountered when using the Branches featur ...