Unreal Engine Issues
Unreal Engine Issues
Bundled compute PSO compilation stalling tender thread
UE - Rendering - Architecture - RHI - Feb 13, 2025A licensee has pointed out a potential bug they found related task graph synchronization and when compiling compute PSOs: [Link Removed]. From the screenshot they sent over, it seems that a task gra ...
GAS: GameplayAttribute picker incorrectly also lists AttributeSets' non-attribute properties
UE - Gameplay - Gameplay Ability System - Aug 21, 2025Context: FGameplayAttribute's details customization lets designers pick any attribute property from any UAttributeSet class. Problem: This currently displays all properties of UAttributeSet class ...
[ALT] - UE56 Editor launched with -AsyncLoadingThread will trigger MTAccess
UE - Foundation - Core Systems - EditorLoader - Dec 10, 2025When launching the editor with the -AsyncLoadingThread command, the engine uses an asynchronous thread to load and instantiate UObjects. At this point, if the instantiated UObject contains an FData ...
[Sequencer MRQ] Spatialized audio is not heard in MRQ renderings
UE - Audio - Sequencer - May 28, 2026Per customer case: [25102237 | Case | Salesforce|https://epicgames.lightning.force.com/lightning/r/Case/500QP00001V41PqYAJ/view] Audio that uses an Attenuation to set Spatialized Audio (just positi ...
[SolidWorks] Complex assemblies will not import correctly
UE - Editor - Content Pipeline - Datasmith - Importer - Aug 25, 2018Using Solidworks 2017 Service pack 4.1 the sldasm files only partially import. Instances, folders, and suppressed parts also mess up the import. Suppressed parts show up from different configuration ...
Different CRC32 Results for Repeated Hashing of UStaticMesh
UE - Foundation - Jul 15, 20241. Download the Licensee repro, compile, and open:https://udn.unrealengine.com/s/contentdocument/069QP00000CdN7WYAV 2. Press the first hatched button on the top bar, next to the Platforms dropdown. ...
Mover standalone backend allows non-persistent sync structs to carry over between frames
UE - Gameplay - Player Movement - Mover - Jul 16, 2025Only certain sync state structs are intended to persist between frames. These are configured via MoverComponent's PersistentSyncStateDataTypes array. There appears to be a bug in the way the standa ...
Rounding of conversion of anim length into frames add an empty frame to the animation
UE - Editor - Content Pipeline - Import and Export - Feb 5, 2026cf. https://forums.unrealengine.com/t/gltf-import-bug-animations-have-an-entire-extra-frame-when-source-animation-is-slighly-above-target-length/2697309 The GLTF importer adds an extra frame to the ...
TPropertyValueIterator skips TMap values when KeyType is a UStruct
UE - Foundation - Core - May 7, 2018From https://udn.unrealengine.com/questions/431271/tpropertyvalueiterator-skips-tmap-values-when-keyt.html The property value iterator has logic where it tries to iterate over all properties in a s ...
iOS Remote Build fails with Date/Time set to Certain Locales
UE - Platform - Mobile - Jan 21, 2019Date/Time formats using commas instead of semicolons will cause iOS compile to fail. "LogPlayLevel: Error: ERROR: System.FormatException: Input string was not in a correct format." Similar Unk ...