Unreal Engine Issues

UBT crashes when doing an incremental build

There is a consistent crash when incrementally compiling headers containing generated code. The code for launching UHT accesses a property which is null when compiling with the UBT makefile. ...

FIOSInputInterface::SendControllerEvents crash due to UIInterfaceOrientation call from game thread

From [Link Removed], licensee reports We believe that querying the UIInterfaceOrientation via UIApplication on the game thread is the issue here. We have made changes to IOSInputInterface.cpp and I ...

Camera Movement is laggy while the mouse button is held down and ShowMouseCursor is enabled if there are AI moving

Camera Movement is laggy while the mouse button is held down and ShowMouseCursor is enabled if there are AI moving. Stat Scene Rendering didn't show any jumps while moving the camera under these cir ...

Packaged Project with Media Player Asset 'From Memory' Crashes and Corrupts Project

There is no Callstack associated with this crash. And I was unable to reproduce this in main due to a known issue when switching the 'Stream Mode' to 'From Memory'. When packaging a project in 4.6. ...

.ini files for packaged games have their settings wiped clean every time the game is run.

The settings .ini files for games packaged for windows appear to be getting overwritten with blank files whenever the game is run. Even if settings are added to the .ini files manually, the files be ...

Circularly referenced blueprints cause stack overflow in a package game without IOStore

Creating a function with parameter type TEnumAsByte<MyEnum> will crash while compiling

This is a regression.This does not affect UE5. Creating a function with parameter type TEnumAsByte<MyEnum> will crash while compiling. In 4.26 and UE5 the code compiles without issue, and the user ...

FSlateApplication::OnControllerAnalog triggers a MouseLeftClick event to be added to the input stack.

It appears that FSlateApplication::OnControllerAnalog triggers a left mouse click to occur on mobile platforms. If developers haven't properly avoided hooking up delegates to the InputComponent for ...

Blueprint Cannot Give Niagara CPU Access To Skeletal Meshes Added From Blueprint

When a user tries to add a skeletal mesh component to a blueprint with a niagara system to use the skeletal mesh with that niagara system, the niagara system will stop rendering because it does not ...

Issue during the CapturingScene phase when having Nanite mesh as source component for HLOD Generation

When generating the textures for Approximate HLOD layers, the Nantie geometry is very low resolution, resulting in the captured textures fitting the actual HLOD geometry poorly. This creates visual ...