Unreal Engine Issues
Unreal Engine Issues
Hot Reload fails when project code class that derives from a plugin code class is modified
UE - Foundation - Cpp Tools - Hot Reload - Oct 11, 2018Hot Reloading fails in 4.21 if a project code class that derives from a plugin code class is modified. The Editor appears to be looking for a corresponding Hot Reload .dll for the plugin, even thoug ...
Comments in PO files are transient
UE - Editor - UI Systems - Localization - Oct 30, 2019Comments in PO files can currently be preserved, however they're not actually imported into our archive files, which means they're reliant on the PO files never being lost (or being generated via so ...
CoreSymbolication.framework fails to load on macOS 11 Big Sur
UE - Platform - Apple - Aug 20, 2020CoreSymbolication.framework has moved, likely into the system library cache. The function, FApplePlatformSymbolication::EnableCoreSymbolication probably needs to be updated in order to accommodate.d ...
Nanite displacement on landscapes not rendering on 5700XT
UE - Graphics Features - Nanite - Mar 27, 2024This only happens on a 5700XT, tested this on the 7900XT and the issue did not occur Initially reported on the Preview 1 forums: https://forums.unrealengine.com/t/unreal-engine-5-4-preview/1763516 ...
Iris - Ensure hit when destroying a torn off actor from AActor::TornOff
UE - Networking - Iris - Dec 11, 2025As of CL 42014318, StopReplication requests that occur during ReceiveUpdate are delayed until all received data from the update is finished processing, including if the actor is torn off. However, i ...
[AI] Navmesh tiles are fully removed when a tile containing an automatic navlink is regenerated using Dynamic Modifiers Only generation
UE - AI - Navigation - Feb 9, 2026An unusual interaction has been found when using automatic navlink generation combined with Dynamic Modifiers Only navmesh generation. When an nav area is modified in a tile that contains an automat ...
Object Scale Not Working with Instanced Static Mesh
UE - Graphics Features - May 19, 2016Using Object Scale in your material with an Instanced Static Mesh does not change the color of the material if you scale the individual instances of the Instanced Static Mesh component. If you scal ...
Cooked materials and material instances size have doubled when upgrading from 5.1.0 to 5.2.0
UE - Rendering - Architecture - Materials - Jul 18, 2023UDN: [Link Removed] A UDN customer has observed that their cooked materials have doubled in asset size going from 5.1 to 5.2. We need to investigate this is only a local issue on their side and no ...
Crash on play if Oculus DK2 is on in Direct HMD mode
UE - Platform - XR - Feb 6, 2015EDIT: UPDATE - All reports about this crash seem to be from laptop machines where the Oculus is running on an NVIDIA 800M or 900M series graphics card rather than the integrated Intel card. ------- ...
UDN: Framework Networking: Listen server needs smoother interpolation of remote clients
UE - Gameplay - Jan 31, 2014Listen server needs smoother interpolation of remote clients. Update throttling and/or low framerates on clients results in poor experience on the listen server. Might be optional for dedicated serv ...