Unreal Engine Issues
Unreal Engine Issues
Viewports aren't updated (black/garbage) when resizing the editor windows
Tools - Apr 23, 2015Found on Linux but Windows seems to have the same problems. When you are dragging/resizing the window, viewports stop updating and/or show garbage. See https://answers.unrealengine.com/questions/21 ...
UBackgroundBlur crashes at PSO creation under D3D12 SM6 when stereo rendering is enabled
UE - AI Workflows - UI Systems - Slate - Jun 4, 2026Any Slate widget that triggers the Slate post-process blur (e.g., a UBackgroundBlur with non-zero strength) hits a fatal D3D12 CreateGraphicsPipelineState failure on first render. The fatal is funne ...
Source Won't Build - UnrealInsightsCLI.cpp References Missing Header
UE - Foundation - Core - May 11, 2020Line 9 in https://github.com/EpicGames/UnrealEngine/blob/4.25/Engine/Source/Programs/UnrealInsightsCLI/Private/UnrealInsightsCLI.cpp is '#include "TraceServices/SessionService.h" which used to be lo ...
Datasmith floods network with UDP traffic in a lab environment
TM - Datasmith Exporter - Aug 28, 2023They've had some luck disabling UDP transport as mentioned in the following articles:https://docs.unrealengine.com/5.2/en-US/udp-messaging-settings-in-the-unreal-engine-project-settings/https://foru ...
Creating a code project named Test will fail the initial compile and every hot reload in Binary
UE - Foundation - Build - Farm - Jul 21, 2016When a C++ project is named Test on a Binary version of the editor, the project will fail to compile. I'm assuming this is from the editor seeing a precompiled header from another file in the engine ...
Inaccurate motion vectors when using different position binding in renderer
UE - Niagara - Jul 27, 2023Even though the particles are not moving, and the velocity is zero, the output motion vectors are non-zero. This seems to only happen if using two sources of particle positions. ...
[CrashReport] UE4Editor_Engine!FNetGUIDCache::GetObjectFromNetGUID() [packagemapclient.cpp:1876]
UE - Networking - Jul 16, 2015I loaded up a two player game in the 'play in editor'. Upon clicking into the client, the game crashed. Clicking into the server did not cause it to crash.I'm pretty sure this happened because I check ...
TitleProperty does not work with VisibleAnywhere properties
UE - Editor - Verse Class Editor - Aug 15, 2023In: [Editor\PropertyEditor\Private\PropertyEditorHelpers.cpp:118] function SPropertyValueWidget::ConstructPropertyEditorWidget checks what type of widget to create. In: [Editor\PropertyEditor\ ...
Lighting Build fails with World Settings Error
UE - Graphics Features - Jan 16, 2015Lighting Builds seemingly successfully but produces a Map Check Error for World Settings. There are several things that can be done to "eliminate the issue" and I have separated them into different ...
When switching versions of UE4 the folder colors do not migrate with the project
Tools - Feb 27, 2015User reports when creating a project and changing the folder colors in 4.6, then opening the project in 4.7/4.7.1, the folders go back to their default color. Users have also reported this happenin ...