Editor will crash while instancing nested AIPerception component template subobjects in an AIController-based Blueprint class during compile-on-load.

UE - Gameplay - Blueprint - Mar 23, 2018

User report of an assertion that fires on editor reload during an attempt to reload an AIController-based Blueprint class with a dependency on a child Blueprint class, both created in a previous edi ...

Region screenshot doesn't work at runtime

Tools - Mar 30, 2018

Region screenshots taken in runtime do not seem to work while they do work when taken in editor. ...

[CrashReport] UE4Editor_Engine!FMaterialShaderMap::GetMeshShaderMap() [materialshader.cpp:2395]

UE - Graphics Features - Mar 30, 2018

User comments in crash group:Duplicating material and switched it cause i have to use itChanging a landscape material.I just import World Machine landscape with multi-layered.Crash when reaching 16 ...

Crash Occurs When Retargeting Mannequin Skeleton to Daz Studio Skeleton

OLD - Anim - May 8, 2018

Crash occurs when the mannequin skeleton is retargeted to the Daz skeleton Does not occur in 4.18.3 ...

Promote to variable in a parent blueprint does not pass/preserve the non-default value in derived children blueprints

UE - Gameplay - Blueprint - Jul 11, 2018

When using the feature "promote to variable" on a pin that represents a value that is not an engine default (Example: Floats = 0.0, Booleans = False, ect..), that default value (for the variable tha ...

Crash upon trying to add a variable to a struct array when the details panel is locked

Tools - Jul 12, 2018

Attempting to add a new element to a struct array through the details panel when the panel is locked results in a crash. Regression?: No This issue did not occur exactly the same way in 4.18, but t ...

Arrays on multicast events called from the server are not passed to clients

UE - Networking - Jul 19, 2018

Arrays that are passed into a Multicast Event as an input are not available on clients who call the function Regression?: Yes This did not occur in 4.19.2 ...

When asynchronously loading levels using the "Async Load Primary Asset" node, the dirty flag of the loaded level becomes Enable

UE - Gameplay - Jul 26, 2018

Asynchronously loading a level that has one or more Actors using the "Async Load Primary Asset" node will enable dirty grug for that level asset. The cause is a modified code(CL-3764602) for the [L ...

Disabling "Support Stationary Skylight" Causes Crash With Forward Shading Enabled

UE - Graphics Features - Jul 30, 2018

Disabling 'Support Stationary Skylight' crashes if you select anything in the editor when Forward Shading is also enabled. Working as expected 4.19 4033788 Found in 4.20 CL# 433996 and 4.21 CL# 42 ...

HISM(Hierarchical instance static mesh) has lightmap problem after building lighting

UE - Graphics Features - Aug 5, 2018

HISM has lightmap issues after build lighting ...