Unreal Engine Issues
Unreal Engine Issues
SButton and SBorder multiply color and opacity twice
UE - Editor - UI Systems - Sep 22, 2016Currently, the SButton and SBorder widgets multiply the color and opacity during OnPaint before calling the super (SCompoundWidget::OnPaint). This causes the operation to be done twice, since the co ...
Physics Constraint angular visualization are missing in 4.11
UE - Simulation - Physics - Apr 14, 2016Physics Constraint angular visualization are missing in 4.11 This is a regression User Description: Since 4.11 angular constraints of the physics constant are not shown in the viewport. In 4.10 ...
Transform track can't be edited for Spawnable empty actor in Sequencer
UE - Anim - Sequencer - Oct 2, 2017Transform track for a spawnable Empty Actor always shows 0, 0, 0 and it can't be edited. I could repro this in 4.17.2 and 4.18 Preview 2. This does not happen in 4.15.3 and 4.16.3. So this could b ...
UnrealVS: Compile Single File no longer working after upgrading to 5.3
UE - Core - Cpp Tools - Oct 2, 2023After installing the UnrealVS version that arrived with 5.3. I can no longer use CompileSingleFile. It does however work on the Lyra project. One difference I notived, however, is that Lyra seems to ...
Unnecessary warning "LogChaosCloth: Warning: Invalid pattern data. Num pattern indices 0 != Num welded indices"... for all SKM cloth
UE - Runtime - Simulation - Apr 26, 2024This warning is technically correct, panel-based cloth is disabled, but it's expected and there's nothing the user can actually do about it. This comes from a UDN. ...
Unable to kill UnrealBuildTool, UBT no longer propegates sigterm
UE - Core - Cpp Tools - UnrealBuildTool - Aug 24, 2026When UBT is launched through one of the standard wrapper scripts, Ctrl-C no longer cancels the build. The `dotnet UnrealBuildTool.dll` process and its compile actions keep running to completion in t ...
Changing Child Actor Class does not update Child Actor Template
UE - Gameplay - Blueprint Editor - Sep 28, 2017WHen the Child Actor Class value is changed in a blueprint, the Template name is not updated. Note: The Settings uner the Child Actor Template dropdown DO update when the class is changed. Workaro ...
Free physics constraints between two objects of differing size causes smaller object to jitter
UE - Runtime - Simulation - Sep 13, 2023A cube constrained to a physics actor will start to jitter uncontrollably when interacted with. (see attached media and repro steps for more details) Tested in the following //UE5-Release-5.3-CL ...
GroomComponent: SetVisibility(false) causes per-frame simulation reset instead of stopping it
UE - Runtime - Deformable - Mar 12, 2026UGroomComponent::TickComponent sets bResetSimulation = true every frame when the component is not visible. This causes NiagaraDataInterfaceHairStrands to triggering a full simulation reset every fra ...
WebBrowser widget appears to remove itself from other widgets in user's project
UE - Editor - UI Systems - Jun 30, 2016WebBrowser widget appears to remove itself from other widgets in user's project ...