Unreal Engine Issues

GetAllMobileRelevantLayerNames drops those layers which are only connected to RuntimeVirtualTextureOutput Node

in UMaterial::GetAllReferencedExpressions, the mobile branch ignores every CustomOutputExpressions including RuntimeVirtualTextureOutput. ...

Ensure after reparenting Blueprint and moving a property to the new parent

Moving a property from a recently reparented BP to its new parent will assert in  FBlueprintCompileReinstancer::MoveDependentSkelToReinst at  ensure(PrevStructSize == NewStructSize) This only see ...

FBX import freezes in DataPrep

FBX file import freezes UE while trying to import into DataPrep by the Interchange importer. The import will start, but then a message will pop up stating "Creating snapshot of world content ... " ...

GameCenter does not login on Match3 startup on iOS

When launching on or opening a packaged UnrealMatch3 project GameCenter does not login for the paired account. This causes Leaderboards and Achievements to appear blank. Tested on iPhone6s_6240 OS: ...

Crash after changing either the Anim Start or End times of an Animation Composite

This is a regression tested in //UE4/Release-4.27 CL#18319896 Crash after changing either the Anim Start or End times of an Animation Composite when using Enter to confirm their value. ...

Crash with Assertion failed shortly after launching packaged First Person CPP project on Oculus Mobile - Referencing SparseArray.h:86/87

The following assertion throws after the project crashes when playing on the device: Assertion failed: Index < GetMaxIndex() [File:D:/P4Workspaces/Switch_3/Engine/Source/Runtime/Core/Public/Contai ...

HLOD Build crashing when building nanite for mesh with 2 material having the same parameters

From Licensee: Catching the exception with debugger allowed us to find a list of materials on the hlod mesh on which the error occured and we were then able to link it to one of our meshes causing ...

Crash in reinstancing after removing a variable from a component and compiling

Adding a new macro to a Blueprint Macro Library after renaming the first macro causes a crash

It seems the editor crashes when adding a new Macro to a Blueprint Macro Library. This only occurs if you rename the macro that gets automatically created when you open the macro library to somethin ...

FLiveCodingModule::StartLiveCoding() unsafe access of FModuleManager::Get().OnModulesChanged()

A user has reported a failing ensure in FMRSWRecursiveAccessDetector::AcquireWriteAccess(), a race condition that has a small chance of happening when launching the editor. FLiveCodingModule::Start ...