Unreal Engine Issues
Unreal Engine Issues
Many downloaded cloud items cause a performance issue when booting Twinmotion
TM - Interoperability - Sep 29, 2025See slack thread: [Link Removed] Resume : In the context of the object substitution for Revit, when TM starts, it exports a csv listing the available objects and their corresponding thumbnail. This ...
Walking into some destructibles crashes the editor
UE - Simulation - Physics - Destruction - Aug 20, 2015Submitted by a licensee on UDN. I verified it and have attached the test level that he provided. In the test map. some boxes fall and break. Walking straight into the boxes causes the editor to cra ...
[CrashReport] UE4Editor_CoreUObject!UPackage::Save() [savepackage.cpp:4597]
UE - Gameplay - Blueprint Compiler - Jul 14, 2017This is a common crash affecting users in 4.16. Users have not provided additional information. Source Context// Set the parent index, ifthis export represents a UStruct-derived object 4589 ...
Pick New sprite option becomes unavailable if you change the view options
Tools - Jan 4, 2018The Pick New sprite option becomes unavailable if you change the view options to either tile or column when working with the keyframes of a 2D animation. This issue affects the project indefinitely ...
Enabling Preview Rendering Level Mobile GLES3.1 on Map With Vector Fields Results in Editor Crash
UE - Platform - Mobile - May 21, 2018Reproduced Crash on 4.18.3, 4.19.2, and Main CL 4081612. Licensee states: Based on a quick inspection of the code, it seems FVectorFieldVisualizationVertexFactory::ShouldCache() returns false (req ...
NavLink component does not account for the cost of the path set by AreaClass
UE - AI - Sep 6, 2018In the test case, the NavLink component has a navigation cost of 1000000000. When the AI navigates to the NavLink the printed cost is only 2677. It is believed that the AreaClass isn't being taken i ...
Copy / Pasting a Widget creates additional Animatable Property transactions in Undo History
UE - Editor - UI Systems - Aug 28, 2018Copy / Pasting or Duplicating a Widget creates multiple transactions in Undo History. These transactions are labeled "Animatable Property changed.' By default, three Animatable Property changed eve ...
Dithered LOD Transition does not work on some mobile devices
UE - Platform - Mobile - Aug 27, 2019I tested with some mobile devices and Dithered LOD Transition did not work on Huawei P20 Pro. This problem does not occur with Snapdragon. This problem does not occur with Snapdragon like Pixel 3. ...
Increasing Font Size Makes The SceneRendering Table Impossible To Read
Tools - Jan 27, 2020The scenerendering graph doesn't display correctly when you increase the Small Font for the Engine. The rows don't adjust to the font size. The user increased font size to make print strings in VR ...
UProceduralMeshComponent::UpdateMeshSection does not call UProceduralMeshComponent::UpdateCollision
UE - Simulation - Physics - Apr 20, 2020Updating a procedural mesh results in an incomplete collision update. Collision bounds appear to get updated properly, but collision data is not updated, despite a navigation rebuild being triggered ...