Deadlock in FXAudio2Device::UpdateAudioClock() whenever a KVM is used to switch to another input

UE - Audio - Mar 7, 2017

I have 3 machines with one set of keyboard, mouse, and monitors. Switching between machines is required during long running tasks such as cooking. ignore-Switch ...

Static Mesh Navigation Collision Properties Not Being Saved Correctly

UE - AI - May 10, 2017

Setting properties for a static meshes Navigation Collision and then reopening the mesh causes them to be reset. This does not appear to occur in 4.14.3. This is a regression. ...

Crash When Selecting Actor in the World Outliner That is Using ColorGradingMode

Tools - Jun 2, 2017

When selecting an actor in the World Outliner that is using the ColorGradingMode specifier (ColorGradingMode = "saturation"), the editor crashes. This did not occur in 4.15.3. This is a regression ...

Calling SetNavigationRule for widgets at runtime does not update the Nav Rule

UE - Editor - UI Systems - Sep 25, 2017

Calling SetNavigationRule at runtime does not update the widget navigation of the selected widget. Regression: No - same behavior occurs in 4.16.3 (CL 3561208) ...

Data Tables can no longer import numeric enum values

Tools - Nov 1, 2017

Some changes to UEnumProperty::ImportText_Internal prevent this importing the stringified number (which is a float) as an enum value. This affects the JSON importer, and maybe the CSV one too. ...

Cannot add a non-static custom thunk to a code class

UE - Foundation - Cpp Tools - UnrealHeaderTool - May 7, 2018

In 4.19, it is no longer possible to create a non-static custom thunk in a class. This was possible in 4.18.3. REGRESSION: Yes. ...

Niagara Not Working with Volumetric Materials

UE - Niagara - Jul 13, 2018

Niagara will not work with Volumetric Materials. Found in 4.20 Preview 5 CL# 4173640 and 4.21 CL# 4207835 ...

Niagara GPU Mesh Particles Not Working In Packaged Project

UE - Niagara - Aug 22, 2018

GPU Mesh emitters will not show up in a packaged project. Found in 4.20 CL# 4302132 and 4.21 CL# 4307852 ...

The Mirror option in the Physics Asset editor is not accurate

UE - Simulation - Physics - Nov 13, 2018

The Mirror option in the Physics Asset editor is not accurate at mirroring the bodies. The position and rotation is always skewed. Regression? No This occurs in 4.20 ...

Niagara module scripts "Map Get" node displays the 'Module' parameter as "Input"

UE - Niagara - Mar 9, 2020

The module parameter in a niagara module script displays the incorrect name Tested: 4.24.3, 4.25P, 4.26 ...