Unreal Engine Issues
Unreal Engine Issues
Incorrect static lighting on InstancedStaticMeshes
UE - World Creation - Worldbuilding Tools - Foliage - Nov 27, 2014Sometimes instances of an InstancdStaticMeshComponent have an incorrect hue after building static lighting. In the thread, the user provides a repro map ...
Lightmap Density Of Imported FBX Offsetting When Lighting Is Built
UE - Graphics Features - Oct 8, 2018Lightmap density of imported fbxs will be offset when lighting is built. Working as expected in 4.19 CL# 4033788 Found in 4.20 CL# 4369336, 4.22 CL# 4433008 This is a regression ...
Optimization Viewmode Quad Overdraw Remains on Screen After Switching to Stationary Light Overlap
UE - Graphics Features - Jan 29, 2018The optimization view mode 'Quad Overdraw' image is not properly cleaned up when switching directly to 'Stationary Light Overlap' view mode. See attached images. ...
Crash duplicating or deleting any component inside of Actor BP if lights or triggers are present
UE - Gameplay - Blueprint Editor - Apr 25, 2017When duplicating or deleting a component whilst a point light is also a component within an Actor BP, the editor crashes. See callstack for info. This is a regression. Working: 4.15.2 Broken: 4.16 ...
Float Curve that is set as a local variable in an actor's function is garbage collected when in Standalone, causing a crash
UE - Gameplay - Blueprint - Sep 9, 2016If a Curve Float local variable is created for a function, it will be garbage collected when garbage collection occurs. This causes the process to crash due to an null pointer error whenever it is r ...
Saving Behavior Tree with Blueprint task inheriting from native class invalidates Blackboard key when BP contains a function
UE - AI - Jul 8, 2025A regression introduced in UE 5.6 causes Blackboard key selectors in Blueprint tasks to become invalid when the Blueprint inherits from a native subclass of UBTTask_MoveTo (or UBTTask_BlackboardBase ...
Emissive for Static Lighting discarded upon Re-opening Level or Restarting Project
UE - Graphics Features - May 24, 2016'Emissive for Static Lighting' discarded when restarting or re-opening a project. I discovered this issue while testing [Link Removed]. This issue does not occur in the binary 4.11 release so I hav ...
Build failure after nativizing any child Blueprint class with function override (regression).
UE - Gameplay - Blueprint - Jun 7, 2018Nativization regression in 4.20 preview 1. Cannot nativize overridden functions. Log Output:UATHelper: Packaging (Windows (64-bit)): D:/Projects/Unreal/NativizeMethod/Intermediate/Plugins/Nativized ...
Editor Crashes when creating a function in Child Anim Blueprint
OLD - Anim - Mar 16, 2017Editor Crashes when creating a function in Child Anim Blueprint. Regression: This issue did NOT occur in 4.13.2 Binary build ...
BP functions with enum-type input argument named 'Category' are erroneously assigned to category 'New Enumerator n'
UE - Gameplay - Blueprint - Jun 4, 2018BP functions with enum-type input argument named 'Category' are erroneously assigned to category 'New Enumerator n' ...