Unreal Engine Issues
Unreal Engine Issues
Android Crash on app launch if AdditionalPluginDirectories contains wildcards in path
UE - Platform - Mobile - Jun 23, 2017Having wildcards in the path for AdditionalPluginDirectories causes apps on Android to crash on launch. When testing this on iOS, the app did not crash but froze at the splash screen instead. Androi ...
DynamicMeshBuilder.cpp does not add a value to the InTangentY variable in the AddVertex function
UE - Graphics Features - Mar 4, 2021This was found as a result of Licensees doing a Code Review of the Engine code. Here's the code snippet in question. It seems to be missing a line similar to Vertex->TangentY = InTangentY;.: int32 ...
Different instanced materials are seen as the same material due to GUID
UE - Graphics Features - Jun 3, 2021See licensee description of the issue: The problem appears when I have two instanced materials with the same number of parameters. I've noticed that ShaderMapId has MaterialLayersParameterIDs where ...
Crash when changing the World Grid Material to Unlit
UE - Graphics Features - Mar 13, 2017A crash occurs when setting the WorldGridMaterial from the Engine Content to the Unlit Shading Model and pressing apply. ...
4.6.1 to 4.7 conversion crash "Assertion failed: Pin != nullptr ...K2Node_DynamicCast.cpp]"
UE - Gameplay - Blueprint - Feb 25, 2015Several Users are experiencing crashes on importing a 4.6.1 project into 4.7.0 (Release) Here are the crash reporter links: [Link Removed] [Link Removed] [Link Removed] [Link Removed] [Link Removed ...
Undo after disconnecting a target pin will cause a series of internal compile errors
UE - Gameplay - Blueprint - Mar 15, 2016Undo after disconnecting a target pin will cause a series of internal compile errors User Description: I've run into what I think is a bug when attempting to compile a blueprint after mistakenly b ...
[AI] Navmesh shows in editor but does not get loaded in PIE
UE - AI - Navigation - May 13, 2024When using static or dynamic modifiers only navmesh, there are times that the navmesh will build and display correctly in editor, but it does not get properly loaded at runtime (PIE/SIE). The Recast ...
Mac - Inconsistent results for Lumen renders
TM - Rendering - Jun 3, 2025Reported in SF [Link Removed] and [Link Removed] Users on Mac are reporting inconsistent rendering results for Lumen in image exports that do not include any settings changes. When exporting some ...
Cast modulated shadows causes black screen on iOS with non-default FOV
UE - Platform - Mobile - Oct 14, 2015Using a FOV other than 90 with Cast Modulated Shadows seems to cause a black screen and weird FOV issues on an iOS device, in 4.9.2. If the camera has FOV=90, it works fine on the iOS device. If th ...
Costs of Static Lights on Render Thread
UE - Graphics Features - Jun 9, 2016A Japanese developer's making a scene that has over 4000 static point lights. They thought the lights don't affect rendering in runtime. But they realized the RenderThread's costs become bigger. I ...