Unreal Engine Issues
Unreal Engine Issues
The Editor may crash in PIE mode if the Engine was built from source code using the Debug Editor configuration.
UE - Gameplay - Blueprint - Dec 4, 2014Building the Engine using Debug Editor configuration can result in a crash if a project is run in PIE mode. No crash occurs in the same project if the Engine is built using Development Editor config ...
Crash in UCanvas::K2_DrawMaterial wioth VideoStreamComponent
UE - Graphics Features - Nov 11, 2021VT Lightmaps render different results and no shadows
UE - Graphics Features - May 21, 2020VT Lighmaps don't have the same results as the regular lightmap counterpart and don;t render shadows. https://udn.unrealengine.com/questions/578318/lightmaps-different-after-switching-to-virtual- ...
Calling UMoverComponent::IsModifierActiveOrQueued() immediately after calling UMoverComponent::K2_QueueMovementModifier() will return false
UE - Gameplay - Player Movement - Mover - Mar 10, 2025Calling UMoverComponent::IsModifierActiveOrQueued() immediately after calling UMoverComponent::K2_QueueMovementModifier() will return false. Checking the code, IsModifierActiveOrQueue() calls FindMo ...
Enabling bUpdateComponentTransformToRootBone in a GeometryCollectionComponent causes broken particles to appear in the wrong location
UE - Simulation - Visual - Jun 22, 2025Enabling bUpdateComponentTransformToRootBone in a GeometryCollectionComponent causes broken particles to appear in the wrong location. When that flag is true, the moment the GeometryCollection (GC) ...
BP using nested child actor components in streaming level causes ensure condition failed
UE - Simulation - Core - Jul 11, 2022This never happens on ue5.0.0 The problem appears to be caused by a deleted PhysicsProxy being registered with Solver. Since the solver accesses the deleted PhysicsProxy, it may crash. Checking a ...
Crash when client tries to connect to server instance using WP
UE - World Creation - Worldbuilding Tools - World Partition - Apr 10, 2023Crash when a Deferred Decal (Translucent) base material has a Nanite Override (Masked Surface) Material and the mesh has Nanite + Ray Tracing enabled.
UE - Graphics Features - Ray Tracing - Aug 14, 2025A crash occurs when Nanite override material instance is used in a project with Ray tracing enabled where: 1 The Material assigned to the static mesh uses Deferred Decal / Translucent and the Nani ...
Editor becomes unresponsive/freezes when a Geometry Collection is destroyed by a Hit Event while simulating
UE - Simulation - Core - Apr 19, 2023This is a regression. Tested in //UE5/Release-5.1 CL23901901 When a geometry collection is destroyed by an On Hit event the editor becomes unresponsive and never recovers. No crash is generated. ...
Watch Pin Crash on Softclasspath
UE - Gameplay - Blueprint Editor - Mar 26, 2020Mousing over a softclasspath pin from a struct while debugging a Blueprint can lead to a crash. ...