Unreal Engine Issues

Lighting Scenarios Map Check warning about multiple skylights not supported

When using Lighting Scenarios and placing a skylight in the lighting scenario levels when you build lighting there will be a map check warning that "Multiple sky lights are active, only one can be e ...

PlatformMediaSources fail to load in the editor.

[SM5] (Node TransformPosition) Error when opening HillTree_02 mesh from Open World Demo Collection

The HillTree_02 mesh from the Open World Demo collection has a shader compile error. The user pointing the issue out is reporting a freeze whenever he attempts to use the asset. I provided a workar ...

Fail to launch ('Attempt to build nav collision') on device when HLOD is generated

After generating HLOD, game launched from launch on device does not run correctly. 4.14 does not seem to have this issue, so this might be a regression. ...

Can't clear AnimBp reference from an old asset(4.10 or before) with a skeletalMeshComponent

When using an older asset(4.10 or before) with a skeletalMeshComponent in a newer engine version, a reference for the original AnimBP remains after changing the mesh component's Anim Class. ...

Blueprint Function Library does not save Struct default values

When a Struct is used as a Local Variable in a Blueprint Function Library, the defaults for its member variables are not saved. If, for example, I enter "3" for an Int member, and "Foo" for a String ...

OnAudioPlaybackPercent Returning Incorrect Start Time of Play node with new Audio Engine

The values returned by the OnAudioPlaybackPercent event node are incorrect when calling a sound to Play with a specific Start Time via blueprint when using the new Audio Engine i.e. AudioDeviceMod ...

Morph Targets broken importing some untriangulated meshes with FBX

Morph Targets broken importing untriangulated meshes with FBX ...

Edit shared defaults for multiple blueprints leads to Engine crash.

Changing any value in Edit shared defaults window with multiple blueprint assets leads to Engine crash. This is a regression from 4.16 ...

Slow response on clicking on InstancedStaticMeshComponent with many elements when using IME

When clicking on InstancedStaticMeshComponent with many elements, Editor memory usage increases and editor freezes until the operation is finished. The wait and memory usage get much worse when usin ...