Unreal Engine Issues
Unreal Engine Issues
FHLSLMaterialTranslator::GetMaterialEnvironment can crash or not load UMaterialParameterCollections
UE - Rendering Architecture - Materials - Apr 30, 2025In UE 5.5, the Editor may crash in FHLSLMaterialTranslator::GetMaterialEnvironment when loading materials with Material Parameter Collections, likely due to async loading. Calling ParameterCollectio ...
InstanceOnly UProperties accessible in Blueprint
UE - Gameplay - Blueprint Editor - Nov 30, 2022Reproduced 3/3 times. Issue does not occur in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed Regression. ...
Crash when deleting BindingOverrides if the target property is left open on the details panel
UE - Anim - Sequencer - Sep 22, 2023Crash if opening ALevelSequenceActor::BindingOverrides in the details panel and run a process that empties the BindingOverrides elements. Workaround: FMovieSceneObjectBindingID FMovieSceneObjectBi ...
Speedtree shader node broken in a Shipping package.
UE - Graphics Features - Jul 6, 2018I attached the 4.19 and 4.20 version of the project. The trees have no leaves when packaging with Shipping in 4.20 preview 5. It works fine in 4.19. ...
[Reverb Effect] - Deactivate Reverb Effect Blueprint Doesn't Deactivate Reverb
UE - Audio - Aug 11, 2021When deactivating a reverb, it's removed from the Activated List, but doesn't get removed from being the active reverb. Confirmed occurs in 4.27 and 5.0 ...
BlackmagicMediaSource causes a memory leak if "Just-In-Time Rendering" option is ON.
UE - Virtual Production - IO - Media - Oct 31, 2023Since 5.3, BlackmagicMediaSource causes a memory leak. This didn't happen on 5.2. You can see the leak on PIE. [Image Removed] [Image Removed] If "Just-In-Time Rendering" option in the MediaB ...
Upgrading Project After Disabling Light PropagationVolume Plugin Causes Crash
UE - Foundation - Cpp Tools - Plugin System - Apr 1, 2016Attempting to upgrade a project from 4.10 to 4.11, or 4.11 to 4.12 with the LightPropagationVolume plugin disabled causes it to crash. Found in converting a 4.10 project to 4.11, and reproduced con ...
[CrashReport] UE4Editor_Kismet!FBlueprintGlobalOptionsDetails::CanDeprecateBlueprint() [blueprintdetailscustomization.cpp:5127]
UE - Gameplay - Blueprint Editor - Jul 19, 2017This is a common crash affecting users in 4.15 and 4.16, affecting over 200 unique users so far. User Descriptionsattempt to import bp from example Source Context 5124 { 5125 // I ...
IOS 11 Freezes When Generating Particles Using SphereMask
UE - Platform - Mobile - Nov 16, 2018When playing a particle using SphereMask, iOS 11 device terminal freezes.This issue is not a crash, it's screen freeze. Reproduced deviceiphoneX :iOS 11.4.1iphone7 :iOS 11.4.1 Not reproduced devic ...
Sequencer's View Options>Expand/Collapse Nodes and Descendants (Shift+V) does not Collapse after being Expanded (UE5.6)
UE - Anim - Sequencer - Jun 25, 2025Sequencer's View Options>Expand/Collapse Nodes and Descendants (Shift+V) does not Collapse after being Expanded (UE5.6). As described in the Steps to Reproduce section, the command expands the prope ...