Unreal Engine Issues
Unreal Engine Issues
TInstancedStruct used in native actor class loses reference to Instanced UObject after BP recompilation
UE - Framework - Blueprint Compiler - Jun 25, 2025When a TInstancedStruct contains a UObject marked with EditInlineNew and DefaultToInstanced, the reference is lost after compiling the Blueprint but only when the struct is part of a native Actor cl ...
Translucent light grid injection behavior
UE - Graphics Features - Nov 15, 2024Light injection into the Translucent Light Grid voxels does not use the correct location for clipping or attenuation. Both of these points are outside the voxel that is being updated. Light attenua ...
Compiler error after changing the class in a Spawn Actor from Class node, undoing with Ctrl + Z, refreshing the node, and reconnecting exposed variables
UE - Gameplay - Blueprint - May 26, 2015Compiler error after changing the class in a Spawn Actor from Class node, undoing with Ctrl + Z, refreshing the node, and reconnecting exposed variables. "Error Internal compiler error inside Creat ...
Destructibles using Form Extended structures with rigid body collision gives wrong hit result
UE - Simulation - Physics - Destruction - Jan 7, 2015DESCRIPTION: When using form extended structure with DMs that are hit by a rigid body the resulting hit does not reflect the correct actor if they are both using form extended. If a DM without form ...
Non-Uniform Mobile Content Scale Values Render Black Screen when Launching to Mobile Device
UE - Platform - Mobile - Mar 3, 2015When attempting to set the configuration for mobile devices within the Engine/Config/DefaultDeviceProfiles.ini, any value that is non-uniform like 1.2 or 1.6 will render a black screen after deployi ...
Slowly flickering display in GearVR
UE - Platform - XR - Jul 12, 2017The appears repeatedly in the log:[2017.07.12-14.57.06:022][ 4]LogHMD: Initializing OVRPlugin session [2017.07.12-14.57.06:652][ 4]LogHMD: Setting user focus to game viewport since session status ...
Control Rig: crashes when compiling after rearranging input pins in an array in Example Rig Unit
OLD - Anim - Aug 20, 2019The crash doesn't occur every time, but it will happen within 3 swap and compiles in my experience. I got multiple different callstacks when I cause the crash using the reproduction steps (they are ...
Failed to generate Nanite data for mesh with bDoFastBuild enabled
UE - Graphics Features - Nanite - Oct 1, 2025If "bDoFastBuild" is enabled on a Static Mesh asset, in-editor it will never be able to have Nanite data built for it, preventing the Static Mesh from using Nanite. There is no way to fix this issu ...
Snapping Pivot to Vertices is Difficult using New Default Keyboard Shortcuts
Tools - Aug 6, 2015A licensee requested this ticket be entered as a bug report. The pivot vertex snapping functionality has changed and no longer functions as it did in prior versions of the engine. Somewhere the key ...
[CrashReport] UE4Editor_Engine!FAVIWriterWin::Initialize() [aviwriter.cpp:239]
UE - Anim - Sequencer - May 24, 2016Error message: Access violation - code c0000005 (first/second chance not available) Source Context: 224 225 hr = Graph->AddFilter(CaptureFilter, L"Capture"); 226 if ...