Unreal Engine Issues
Unreal Engine Issues
Procedural Mesh Component 'Create StaticMesh' Function corrupts mesh tangents
UE - LD & Modeling - Modeling Tools - Mesh Editing - Oct 25, 2018After clicking 'Create StaticMesh' button on an Procedural Mesh Component, and saving the mesh, the created mesh has bad tangents. Included in the attachments, is a test project with a parallax mate ...
Crash launch application adding .umap url
UE - Foundation - Core - Aug 6, 2020The application crashes when adding ".umap" to the launch map at application launch. If not specify ".umap", it will be able to launch application. There appears to be a failure to parse the URL. Th ...
Crash reimporting an FBX with LODs and Morph Targets, but leaving "Import LODs" disabled
UE - Editor - Content Pipeline - Import and Export - Jan 4, 2017Error message: Assertion failed: ImportedResource->LODModels.IsValidIndex(LODIndex) [Link Removed] [Line: 282] Source Context: 270 * Constructor. 271 * Converts a skeletal mesh to ...
LevelStreamingPersistence: BP variables that aren't Instance Editable get reset
UE - World Creation - Worldbuilding Tools - Mar 6, 2026Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors and components that are part of a streamed level. Blueprint variables can be marked as instan ...
Attempting to override timeline function in child blueprint crashes editor
UE - Gameplay - Blueprint - Sep 24, 2015Attempting to override a timeline within a child blueprint causes the editor to crash. Frequency: 4/4 Crashreporter: [Link Removed] ...
Undo/Redo can cause the gizmo to desync from a leaf-selected component
UE - Editor - Workflow Systems - Oct 18, 2021This is a regression from 4.27. This is happening because of the change to typed elements. UEditorEngine::PostUndo, when combined with the typed element changes causes the selection set to reorder ...
Orphaned BP actors when using UWorldPartitionBuilder
UE - World Creation - Worldbuilding Tools - World Partition - Nov 21, 2025From an EPS case: --------------------------------- We're seeing a recurring issue where child BP actors are becoming orphaned during any processing that uses UWorldPartitionBuilder. It affects ...
Download of Starter pack sometimes fails
TM - Core - Sep 11, 2025The Find Node Can Crash on Compile After a Blueprint Compile Error
UE - Gameplay - Nov 21, 2019The "Find" node can cause a crash if the a map with a struct value changes type while connected, is disconnected and reconnected. Compilation fails and crashes the engine. Found in 4.23.1 CL#963142 ...
Editor crashes when attempting to reimport multiple Data Table assets that do not have an associated data source file
Tools - Oct 19, 2018Attempting to Reimport multiple Data Tables that do not have associated data source files results in the Engine crashing. When a single Data Table is selected to be reimported, the Editor asks for t ...