Unreal Engine Issues

Ensure condition failed: bPlayingBackwards ? (CurrentPosition <= PreviousPosition) : (CurrentPosition >= PreviousPosition)

The problem is caused by the animation sequence playback position being set out of range from Sequencer. The call stack is :  UE4Editor-AnimGraphRuntime.dll!FAnimSequencerInstanceProxy::UpdateAnim ...

The DistanceCurveModifier generates Distance Curves with zero values for Root Motion animations

The DistanceCurveModifier data modifier generates curves that return zero values only. This issue has been tested on several Animation Sequences with enabled Root Motion and always occurred. ...

LIVE: Multiplying an FQuat*FQuat via pass-by-value crashes editor on open

If a function takes in an FQuat value and then multiplies it by an FQuat, the project will build properly but then crash when trying to launch the project in the editor. Example project available b ...

Oculus mirror window goes black when headset removed for any mirroring mode besides 0

If using any hmd mirroring mode besides 0 on Oculus, when the headset is removed, the mirroring window goes black in a packaged build, or in -game, for example: UE4Editor.exe VrTemplate4x15 MotionCo ...

Setting FActorSpawnParameters::bRemoteOwned causes inconsistent behavior when spawning actors

If FActorSpawnParameters::bRemoteOwned is set to true, calling SpawnActor with this spawn param on begin play has different behavior than calling the SpawnActor elsewhere during runtime. If using n ...

Destructible Mesh changes are not updated.

Use Mouse for Touch leads to fire Released and Clicked with Pressed at the same time for UMG Button

Pressed, Released and Clicked should be fired in the same manner w/wo Use Mouse for Touch option. These three events are fired at the same time when enabling the option. [Image Removed] ...

UForceFeedbackEffect is only making slight vibration in iOS when value rises from 0 or effect is started.

UForceFeedback is expected to give vibration just like in the graph of the asset. But only in iOS it is not. It is expected to give continuous vibration following the forcefeedback asset, but only ...

Crash on packaged game. 4.23 will not nativize a class that creates instanced properties inside itself

Description from the user: up to 4.23 properties nativize normally if they are written in C++ with the Instanced specifier. The discerning difference is that that there was no Blueprint Class itsel ...

Steam VR client crash when connecting to Server

Client crashes when connecting to server on Vive. Did not reproduce with Oculus Rift. ...