Unreal Engine Issues
Unreal Engine Issues
Iris: CurrTimeMS in FReplicationReader::ResolveAndDispatchUnresolvedReferences saturates on ARM64, so unresolved handles never move to the cold cache
UE - Framework - Networking - Oct 23, 2026In FReplicationReader::ResolveAndDispatchUnresolvedReferences, CurrTimeMS is computed as static_cast<uint32>(FPlatformTime::Seconds() * 1000.0f). FPlatformTime::Seconds() includes GetSecondsTimeOffs ...
FFT bloom disappears for some kernel/viewport size combinations (survey grid sized for R instead of 2R)
UE - Rendering - Features - Oct 22, 2026FFT bloom (convolution bloom) renders nothing for some combinations of kernel size, r.Bloom.ScreenPercentage and viewport sizes (e.g. 50% and 1024 x 768)Root cause PostProcessFFTBloom.cpp computes ...
Open Formats: USD Reimport - settings for USD not getting stored
UE - VEI - Open File Formats - Oct 16, 2026Legacy USD importer doesn't remember import options after editor restart. Issue affects both 5.7 and 5.8. The user's choice for "Kinds to Collapse" is stored as a editor preference rather than per a ...
UBA: crash related to BeyongTrust PGHook.dll and Detour for local jobs.
UE - Core - Cpp Tools - UnrealBuildAccelerator - Oct 9, 2026A license provided a log containing a UBA crash related to PGHook injecting itself when ISPC runs. ...
Resolve Referencing Properties not working on sub-objects
UE - Editor - Oct 5, 2026Property resolution doesn't work in many many cases. Only works with dependencies with properties on the highest level of the asset (TObject/TSoftObject as a variable) After some debugging, it appe ...
UBT compiler output is garbled when run via UAT (Japanese system locale)
UE - Core - Cpp Tools - Oct 2, 2026When UnrealBuildTool (UBT) is launched by UAT, for example by RunUAT.bat BuildCookRun build, localized (Japanese) MSVC error messages show up garbled in the console and in UAT's Log.txt. The UBT log ...
GPU Scene reserved resources can break Niagara mesh preview rendering
UE - Rendering - Architecture - Niagara - Sep 28, 2026When a Niagara emitter has multiple Mesh Renderers and each renderer draws a different subset of particles (via Renderer Visibility), all renderers are drawn using the color of particle index 0 in t ...
Particle Random Value is the same for all particles with a Niagara Mesh Renderer
UE - Rendering - Architecture - Niagara - Sep 28, 2026A material using the Particle Random Value node returns the same value for every particle drawn by a Niagara Mesh Renderer. Particle transforms are not affected, only the random value. This happens ...
[Niagara][5.8] Data Channel Read and Write register with an identical type hash when fx.Niagara.DataChannels.Enabled is set from ini, hitting checkf in FNiagaraTypeRegistry::RegisterTypeInternal
UE - Rendering - Architecture - Niagara - Sep 28, 2026Affects: 5.8 (verified on Release-5.8), Windows, EditorSummary Adding fx.Niagara.DataChannels.Enabled=true to an ini file makes the Niagara editor assert when a Data Channel Read is created. The sa ...
Update prepackaged dotnet to latest 10 patch release due to crash on Mac OS.
UE - Platform - Mac - Sep 24, 2026A dotnet crash occurs sporadically with a sigsev or sigbus when running on Mac OS. This is in the dotnet executable itself, and can happen on commands like `dotnet build`, not just on executing the ...