Unreal Engine Issues
Unreal Engine Issues
[CrashReport] Assertion failed: !bIsReentrant - UE4Editor-UnrealEd.dylib!SaveWorld()
UE - Platform - Apple - Jul 27, 2017This is a common crash on Mac in 4.16 and has occurred since at least 4.14. User DescriptionsI added a character to a blank map and tried to save it. Callstack from LogLogEditorViewport: Clicking ...
Niagara Scalability Crash When Processing Significance
UE - Niagara - Jun 4, 2025Method FNiagaraScalabilityManager::ProcessSignificance() iterates on indices from Context.SignificanceIndices and uses them to access the State and ManagedComponents arrays. It can then decide to cr ...
MovieRender Pipeline Skips Output Frames during GC
UE - Anim - Sequencer - Jun 8, 2020This is being seen in the wild... can release a temporary fix until 4.26 when we can change the headers and fix it for real. ...
FirstPerson template project crosshair has white background on Samsung S6 Edge
UE - Platform - Mobile - Dec 6, 2016This is a regression from 4.13.2 Seen on a Galaxy6Edge_6714 OS: 5.0.2 This was not seen on a HuaweiP9Plus_9532 OS: 6.0 ...
Crash when using Mesh Reduction on ScotsPine_01 for LOD3
UE - Graphics Features - Jan 30, 2017A crash occurs when trying to use the Mesh Reduction tool for the ScotsPine_01 static mesh from the Open World Demo collection. The assets from this project are usually very processor heavy due to ...
Crash when creating a static mesh from a Procedural Mesh Component that has been used with a Create Mesh Section node
UE - LD & Modeling - Modeling Tools - Mesh Editing - May 5, 2021When creating a static mesh from a Procedural Mesh Component that has been used by a Create Mesh Section node, the editor crashes. The editor doesn't crash when selecting the Create Static Mesh butt ...
Ensure occurs if the decal scale is set to a very small value
UE - Graphics Features - Jun 15, 2022The variable emitting this ensure (RelativeWorldToDecalMatrix) is not actually used, so this line can be removed. FDeferredDecalPS::SetParameters ... const FLargeWorldRenderPosition AbsoluteOri ...
Imported tiled landscapes into World Composition Browser have seams between landscape tiles
UE - LD & Modeling - Terrain - Landscape - Mar 19, 2015Landscape seams appear between world composition browser imported heightmap tiles. Workaround: Run over seam with smoothing tool set to strength 0.0 ...
Blueprint Functions Aren't Listed in the Profiler Tool
UE - Foundation - Core - Sep 19, 2019Blueprint functions aren't showing up in the Profiler Tool. Found in 4.23.0 CL#8386587 Reproduced in 4.24.0 Main CL#8781358 ...
FKConvex::ElemCalcAABB ignoring current transform.
UE - Simulation - Physics - Apr 15, 2016FKConvexElem::CalcAABB was ignoring the elements currently defined transform, and only scaling. This means that any actor that has a transform (not just Merge Actors) could potentially have very dis ...