Unreal Engine Issues
Unreal Engine Issues
Renaming a level by WorldPartitionRenameDuplicateBuilder fails if the level contains GroupActor with non-spatial actors
UE - World Creation - Worldbuilding Tools - World Partition - Oct 24, 2023Referece to the source level should be fixed by FReplaceObjectRefsArchive, but it is not working because ArIsModifyingWeakAndStrongReferences is not set. It can be fixed by setting the flag.class FR ...
FAnimationRuntime::BlendPosesPerBoneFilter() causes an assertive crash when Skeletal Mesh LOD is changed
UE - Anim - Runtime - Nov 1, 2023The crash occurs from "check(BoneBlendWeights.Num() == NumBones);" This crash occurs when the following conditions are met;The skeletal mesh LOD is changed.The number of bones is difference between ...
Sequence with restore state set is causing a "Fatal world leaks detected" crash
UE - Anim - Sequencer - May 14, 2025We recently had a few occurrences of crashes caused by a "Fatal world leaks detected" error when unloading a level (in a packaged game and in editor). I tracked down what was keeping a references t ...
Levels lose folder hierarchy in Levels window on streaming method change
Tools - Mar 19, 2019In the Level Window, Sub Levels which are nested inside of a folder will lose their hierarchy upon changing their streaming methods. ...
Some texture files cannot be exported from the editor
Tools - Feb 4, 2015There are instances where some texture files cannot be exported from the editor. In this older post a user had reported this with the file T_Sky_Blue from the engine folder. Only this file has been ...
[Review Tool] The editor crashes while attempting to load a modified Blueprint that uses Interface for review.
The crash is due to previous Rename operation, that reset a preallocated array which later FAsyncPackage2::ExecuteDeferredPostLoadLinkerLoadPackageExports tries to use. Before loading change list ...
Invisible child components appear for one frame on scene capture 2D windows if another component is attached.
UE - Gameplay - Oct 1, 2015Invisible child components appear for one frame on scene capture 2D windows if another component is attached. ...
Hot reloading with a plugin in the project prevents the project from being able to save.
UE - Foundation - Core - Jul 8, 2015Hot reloading a project that includes a plugin will not be able to save if the plugin is used in the project. ...
Force Next Floor Check doesn't work when the player is stopped
UE - Gameplay - Player Movement - Oct 6, 2016Force Next Floor Check doesn't work when the player is stopped, even though the tool tip says that it does. User Description: I'm trying to shrink / grow the collision capsule for our needs but wh ...
Actor components in blueprintable structs are uneditable in full BP editor, but not on instanced actors or in data BP editor
UE - Gameplay - Blueprint Editor - Jan 24, 2024When an actor has a blueprintable struct that contains a reference to an actor component and that component is created default in the actor's constructor, the struct and the component will be unedit ...