Unreal Engine Issues

Changing default click trace channel in player controller causes widget to not register the mouse

When the default click trace channel is set to something other than ECC_Visibilty, the editor does not take the change into account when determining which channel is being blocked. Download link fo ...

Nativized widgets that include a custom button cause a crash if Event Driven Loading is enabled

Nativizing a Blueprint that includes a custom button (a Blueprint parented to the "Button" class) causes a crash when Event Driven Loading is enabled. Disabling Event Driven Loading can workaround t ...

UMG Slider displays long or wrong percentages when Step Size is set to 0.1

When the Step Size is set to 0.1 for a Slider and Slider value is multiplied by 100, it will display weird numbers when moving the slider back from 100%. Changing the Step Size to 1 and changing th ...

Slate widget may incorrectly consume key up events causing some UI to get stuck

This is a bug reported from a UDN customer with a sample project and video attached that goes over the input consumption states and how they are incorrectly being set when changing UI modes ...

Ticking world for the anim montage sequence details preview scene in widget is prone to crash

UDN: ChildBP - When replacing Static or SkelMesh Compoent inherited from the Parent Class, Socket list doesn't update

This is simple, but maybe hard to explain, so hear with me. I've attached a sample project and Repro Steps below in case it's not clear. Basically: 1. Make BP_Parent with an unassigned Mesh (Stati ...

When creating a "Cursor" in UMG or HUD blueprints there is a noticeable lag mouse position and the "New Cursor" Position.

When setting up any sort of image to following the mouse there is a noticeable lag between the position of the mouse and the position of the image that is being set to the mouse position. ...

Mobile Previewer: Safe Zone Invalid Until Window Resize

When the Mobile Previewer loads, the Safe Zone widget is not working properly at startup, and requires a window resize to update to the correct Safe Zone. ...

Instanced object properties get cleared when compiling some (all?) types of Blueprints (Actor components and user widgets at least)

If an ActorComponent contains a UObject property of a type that is DefaultToInstanced, any time a Blueprint of a class containing that ActorComponent is compiled the UObject value is reset to None. ...

Material Vertex Interpolator with a scalar output is replaced by MCT_Float1 in the output translation which can cause arithmetic errors