Unreal Engine Issues
Unreal Engine Issues
Cannot change Collision Profile of BP component instances
UE - Simulation - Physics - Oct 24, 2019BP instances placed in level cannot have their components' collision profiles modified to anything other than default and custom. Note that this did not occur in 4.22 (after applying the separate ...
Niagara system loses source emitters when moving Engine from 4.22 or earlier to 4.23 or later.
UE - Niagara - Nov 29, 2019The following code causes this behavior.// NiagaraSystem.cpp for (FNiagaraEmitterHandle& EmitterHandle : EmitterHandles) { EmitterHandle.ConditionalPostLoad(NiagaraVer); if (!EmitterHandl ...
Problems in skeletal mesh merge
There are a few issues a licensee has found with the skeletal mesh merge operation. See the UDN for more details and the proposed fixes. Note, the issue with the cloth merge is already logged in a ...
bIgnoreAllPressedKeysUntilRelease only applies to keys in the previous mapping
UE - Gameplay - Input - Jun 16, 2022This is because the RebuildControlMappings function only checks this flag when you have a mapping that was already added, we should apply this for any new mappings as well. I'll update the repro s ...
Disabling bLerpUVs in Nanite Settings of Static Mesh causes texture warping in clusters
UE - Rendering - Features - Nanite - Jan 21, 2025The licensee has identified a potential fix by changing if( Settings.bLerpUVs ) to if( Settings.bLerpUVs || UVIndex == 0 ) On line 389 of NaniteBuilder\Private\Cluster.cpp in UE 5.5 ...
Poor Vulkan RHIThread performance in Development builds on some Android
UE - Platform - Mobile - Systems - Dec 10, 2024Community-attempted workaround received in [Link Removed] Closed Correct fix submitted to 5.6 FNMain in [Link Removed] whic ...
Copy-pasting custom property nodes (ControRig etc.) results in invalid bindings, perf issues
UE - ACT Character - Control Rig - Jul 28, 2025From this UDN: [Link Removed] Suggested fix:Override PostPasteNode to perform the GUID update andAdd validation on load to strip 'invalid' copies that do not correspond to a valid pin input ...
set negative values in 'New window position' to set position of 'Play in New Window'
Tools - Mar 30, 2018Selecting negative values for window resolutions leads to a crash. ...
Crash After cutting and pasting a blend radius track in sequencer
UE - Anim - Sequencer - Oct 27, 2017Crash After cutting and pasting a blend radius track in sequencer ...
Actor in Map in Struct Causes Crash When Changed
UE - Gameplay - Blueprint - Mar 8, 2018User submitted bug. Editor will crash after changing key or value in Map. ...