Blueprint classes are listed in Object pickers, but will not work as expected

UE - Gameplay - Blueprint - Jul 28, 2020

Because of the way blueprints are implemented, the "Blueprint Class" asset actually points to the editor-only UBlueprint object. Because of this, all blueprint classes will show up as options for ge ...

UDataLayerManager::Initialize perf issue in Editor build

In editor, WorldDataLayers acceleration table used to map DL Names to DL instances is not created. The main reason was to avoid to handle all the case where it would need to be updated. When UDataL ...

[CrashReport] UE4Editor_Engine!ULevel::GetWorldSettings() [level.cpp:1643]

UE - Gameplay - Aug 21, 2017

This is a common and longstanding crash that has occurred since at least 4.12. User descriptions cover a variety of actions. User DescriptionsCompiling a playerblueprint with firing logic and advan ...

Additive Animation does not work as intended when Ref Frame Index is more than zero

UE - Anim - Runtime - Dec 19, 2023

In some conditions, additive animation shows different/wrong behavior on Standalone Game and packaged game, from the other PIE. Watch the attached video. [Link Removed] The key points to reproduce ...

[CrashReport] UE4Editor_BlueprintNativeCodeGen!FBlueprintNativeCodeGenModule::GenerateSingleAsset() [blueprintnativecodegenmodule.cpp:391]

UE - Gameplay - Blueprint Runtime - Aug 22, 2016

This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below. Error message: Assertion failed: bSuccess [Link R ...

[CrashReport] UE4Game!FStreamingManagerTexture::FStreamingManagerTexture()

Tools - Jun 6, 2016

This Jira was created from CrashReports submitted by the public due to the high number of occurrences. This crash is only occurring in packaged games, not in the editor. The Logs contain the follo ...

[CrashReport] UE4Editor_UnrealEd!TSet<FEditorUndoClient * | SActorDetails::~SActorDetails

Tools - Sep 20, 2017

This is a somewhat common crash coming out of 4.16 and 4.17. Users have not provided any description of their actions when the crash occurred. The top line of the callstack and the source context ...

Package Map may clear out references to GUIDs on clients but not servers

UE - Networking - Jul 13, 2020

Upon Seamless Travel, the Package Map will attempt to clear out "old" entries in the Guid Cache by marking them with a timeout. The only entries that will actually be marked for a timeout are entrie ...

BP hierarchy change triggers incorrect map actor load warning: AttachTo: '{0}' is not static {1}, cannot attach '{2}' which is static to it.

UE - Gameplay - Blueprint - Apr 11, 2024

When a blueprint's component hierarchy is changed by changing a child component's mobility value to Static while deleting its parent component which has Movable mobility, levels saved with an outdat ...

Niagara module inputs don't handle bitfield enums correctly

UE - Niagara - Feb 17, 2025

As one clicks on the enum fields trying to form an input, the log is written with a variation of the following: [2025.02.14-17.42.38:940][521]LogNiagaraEditor: Error: Error getting default value fo ...