Unreal Engine Issues

Light Components fail to propagate certain property changes from Sequencer

Character jumping can become permanently blocked under subpar net conditions

Problem Under laggy networking conditions, if the user rapidly presses the jump button the character can at some point stop responding to jump input. Initial Thoughts It looks like there's a logi ...

Changing MaterialQualityLevel causes a crash due to a ShaderMap mismatch in UniformExpressionCache

A crash may occur when changing the MaterialQualitylevel via Scalability due to a race condition. The issue occurs because in ScalabilityCVarsSinkCallback(), when it creates the FGlobalComponentRec ...

Reimporting mesh will wipe any collisions that were setup using the Static Mesh Editor

When Reimporting a mesh the collision that is created using the methods in the Static Mesh Editor will be wiped if there was not previously setup UCX custom collision. ...

Flipbook components' collision in Characters is ignored

Flipbook components' collision in Characters is ignored. ...

Hot reload does not update Enum entries

Performing a hot reload after updating an Enum will not reflect the update until the editor is closed/reopened. UPDATE (8/23/17): Restarting the editor dose not immediately update the enum. When ...

Sub Classing World Settings Causes Hot Reload to Crash

When creating a subclass of World Settings, attempting to use the in-editor compile button to compile the code causes the editor to crash. Found in 4.11 Preview 4. Reproduced in 4.10.2 binary and ...

Playing sequences in reverse snaps after sequence has first ran

I first came across this bug when I was working with Actor Sequences and noticed that the door I had opening would snap back when I tried to close it. Later I discovered that the issue was with play ...

USkinnedMeshComponent::FindClosestBone does not respect bRequirePhysicsAsset parameter

A licensee has reported that the USkinnedMeshComponent::FindClosestBone function does not respect the bRequiresPhysicsAsset parameter, resulting in the bone returning bones that are not part of the ...

[CrashReport] UArrayProperty::DestroyValueInternal

This is a somewhat common crash that has affected multiple users in 4.17. User Descriptionstried to compile a blueprint after changing blueprint interface function definitions. Source Code 121 ...