Cannot not add child to horizontal box after drag and drop

UE - Editor - UI Systems - Apr 28, 2016

After dragging a widget around, a horizontal box will no longer accept children ...

Niagara Components can unregister themselves in the process of component registration

UE - Niagara - May 1, 2019

Spawn system attached with a system where bAutorDestroy is true and one data interface is invalid will crash the engine. ...

Two animation assets are created when Pawn is recorded in TakeRecorder.

UE - Anim - Sequencer - Jul 21, 2021

If you specify a Level Sequence of "TakeRecorder_Skeletal" in step 3, there will be only one animation created. The licensee wants this to be the same behavior. ...

Calling TearOff then Destroy on an actor results in client actor also being destroyed

UE - Networking - Jan 14, 2021

When calling TearOff followed immediately by Destroy, the channel will be closed with the reason that the actor was destroyed, so the actor will be destroyed on the client as well. In the UDN linke ...

Assertion in Linker.cpp when running .exe using Nativized BP

UE - Gameplay - Blueprint Runtime - Nov 9, 2016

When using the experimental nativized blueprint assets, .exe projects will crash with an assertion failure in the LinkerLoad.cpp Line 3900. This crash will only occur using nativized blueprint asse ...

CharacterMovement component is not accurately reflecting the characters velocity when becoming uncontrolled during movement.

UE - Gameplay - Sep 16, 2019

The boolean "bRunPhysicsWithNoController" has an attached note that reads: " * Normally without a Controller, movement will be aborted and velocity and acceleration are zeroed if the character is w ...

Crash while unloading a streaming level while spawned decals exist in the unloaded level

UE - Graphics Features - Aug 18, 2017

When unloading a level containing a decal that is using a dynamic material instance the editor will crash. ...

Lightmass crash after finished building and hitting save

UE - Foundation - Core - Mar 19, 2015

User is reporting that the editor will crash after lightmass has finished building and they click to save the project. ...

OnComponentEndOverlap and GetOverlappingActors are not in sync

UE - Gameplay - Dec 23, 2014

GetOverlappingActors will return a value when used immediately after OnComponentEndOverlap. Putting a delay after the OnComponentEndOverlap call will result in GetOverlappingActors to return null, s ...

Duplicating emitter asset leads to cross communication between modules

UE - Niagara - Jul 21, 2020

Copying an emitter asset through the content browser will lead to cross communication when the two are used in the same system  ...