Unreal Engine Issues
Unreal Engine Issues
adjusting the scale of a DM via BPs will not give accurate collision
UE - Simulation - Physics - Destruction - Dec 8, 2014DESCRIPTION: Adjusting a DMs scale via blueprints will cause issues for the collision of the DM once it has been scaled up or down. Scaling down by half or up by a value of 2 or 3 is easier to see t ...
Sound Track in Matinee Ignoring Track Location and Playing Audio at Beginning of Sound Wave/Cue
Tools - Sep 22, 2015When scrubbing the Matinee handle with a Sound Track added, no matter the location of the handle, the sound wave associated will play from the beginning of the audio file. Tested in 4.8.3 - 2634408 ...
Child actor components fail to attach in cooked builds when mobility is set to movable and end up at the origin
UE - Gameplay - Oct 21, 2025Context: A Child Actor Component allows an actor in Unreal Engine to contain another actor as its child (component). Problem: The problem is inconsistent handling of child actor component mobility ...
Using GeoMerge on fragments of a GeometryCollection (GC) will create a new single particle while removing the old particles, but although you end up with less particles, the disk file size of the GC uasset increases.
UE - Runtime - Deformable - Nov 26, 2024Using GeoMerge on fragments of a GeometryCollection (GC) will create a new single particle while removing the old particles, but although you end up with less particles, the disk file size of the GC ...
ShowOnlyInnerProperties does not work on a struct property in a class nested within another class as an instance
UE - Gameplay - Blueprint - Feb 19, 2019When the ShowOnlyInnerProperties property specifier is used for a struct property, the properties contained within the struct are exposed to the Blueprints Details panel as if they were part of the ...
Crash undoing variable change in Animation Blueprint.
OLD - Anim - Aug 1, 2016Crash occurs when the user changes a variable in the animation blueprint, and then undo's the change. Note that this occurs with any variable being used, but the callstack will be some what differe ...
Sub-world partitions do not properly handle partial editor loading as world partition standalone level instances' spatially loaded actors do not get loaded even when the Level Instance is force loaded or loaded in by region.
UE - World Creation - Worldbuilding Tools - World Partition - Aug 19, 2025Context Level Instancing is a level-based workflow designed to improve and streamline the level editing experience. In a standalone Level Behavior, when the Level Instance Actor is loaded through it ...
Low-level memory tracking has negative values for "FMallocUnused" and "Untracked"
UE - Foundation - Core - Oct 6, 2020"FMallocUnused" is immediately bellow 0. "Untracked" is reported to go below 0 after very long playtimes (over 36 hours). Reported in version 4.25.3(CL 13942748). Tested and found negative values f ...
Local binary build fails for iOS platform.
UE - Foundation - Core - Oct 5, 2017Attempting to create a local binary build of the Engine for the iOS platform using BuildGraph is currently failing. While trying to build UHT for Mac using a remote build, the build fails because it ...
[CrashReport][Assert] UnrealEditor-RHI!FRHIResource::MarkForDelete() [Engine/Source/Runtime/RHI/Private/RHIResources.cpp:49]
UE - Rendering - Architecture - Materials - Dec 18, 2024One of the users described this issue as below. "At seemingly random times while working in the material graph, some action will cause a hitch or freeze, and quickly after the engine will crash, an ...