Unreal Engine Issues

Particle disappears if it is using PSA_Velocity and setting custom time dilation 0

A licensee reported some of their particles disappear when setting the actor's custom time dilation 0. This seems to happen when a particle is using PSA_Velocity as Screen Alignment. This repros in ...

Widget blueprint details panel appears to jitter when dragging widgets in the designer tab

When clicking and dragging a widget in the designer tab of a widget blueprint some options in the details panel will begin to move/shake/jitter/readjust. ...

Adding a widget to a grid panel inside the grid panel tick can cause an out-of-bounds error

This is caused by adding an item to a grid panel inside the grid panel iteration loop. The same operation to canvas panel goes well without any errors. The difference is that the array iteration in ...

>1ms increase in frame time with showflag.translucency , despite minimal translucency in the scene

Licensee reports this change, and can confirm a very rough similarity observed in a template project in 4.27: [Image Removed] ...

Custom Water Body does not work with its own Distance Culing

WaterBodyCustom seems not to work with Distance Culling settings on its own actor, either Draw Distance/Never Distance Cull or Allow Cull Distance Volume.  It only can be controlled by the CullingD ...

Ctrl + z still active in PIE

Users can select ctrl + z while playing in Editor causing PIE to stop and undo last change, often freezing the editor temporarily, and sometimes causing a crash. Workaround: This does not occur if ...

SceneCaptureComponents do not respect changing visibility or hidden in game for their preview mesh

Controller Assignments appear incorrect for UI when "Skip Assigning Gamepad to Player 1" is set to true

When using a controller to navigate/ interaction with UI it appears that the "Skip Assigning Gamepad to Player 1" option is not taken into account when assigning input for UI. ...

[CrashReport] UE4Editor_Engine!DoReadTaskResults() [shadercompiler.cpp:147]

Memory leak when rendering some meshes with ray tracing enabled

This memory leak seems to be caused by the TMemStackAllocator of FRayTracingMeshCommandOneFrameArray. Using the FDefaultAllocator for FRayTracingMeshCommandOneFrameArray works as a workaround. // ...