Unreal Engine Issues
Unreal Engine Issues
Virtual Texture Data GetNumMips reports one fewer mip than expected
UE - Graphics Features - Feb 27, 2025FVirtualTextureBuiltData::GetNumMips() can return 1 fewer mip than it should due to a potential clamping issue at the end of FVirtualTextureBuilderDerivedInfo::InitializeFromBuildSettings() where it ...
Point light leaking throught thin geometry
UE - Graphics Features - Oct 29, 2024In 4.27, ray traced point lights can leak through thin meshes. This bug does not exist in Unreal Engine 5, due to many of the potential rendering areas being fundamentally changed. ...
Nodes unavailable branching off Get Player Controller Unless Context Sensitive is unchecked
UE - Gameplay - Blueprint - Oct 23, 2014In a project in UE4.5, when opening an animation blueprint, in the Event Graph when the player branches off the "Get Player Controller" node to search for "Get Mouse Position" it will not be shown i ...
D3D Device Lost 'HUNG' crash in FD3D11Viewport::PresentChecked
UE - Graphics Features - Oct 31, 2016This is a new D3D crash affecting multiple users in 4.14 Preview 1. It is currently the #1 crash in the Preview. Information provided by users:Just pressed create project...Openning QA Game with - ...
Keyboard Shortcuts don't work on the Outliner Window if it is detached from the Main Window
UE - Editor - May 27, 2025Keyboard Shortcuts don't work on the Outliner Window if it is detached from the Main Window. As described in Steps To Reproduce, as soon as the Outliner Window is detached from the Main Window, most ...
All Classes Tab of Modes Panel Not Updating Automatically
Tools - Jun 2, 2016Blueprints are not appearing in the All Classes tab of the modes panel after being loaded until the tab is switched. Found in 4.12 binary. Reproduced in 4.11.2 binary and Main CL 2994701. ...
Case Child Actor Component validation error when set as editor-only
UE - Framework - Components - Jun 4, 2024When a blueprint actor with a child actor component is placed in a level, and the child actor component is set as editor-only, the output log will show a validation error when the actor is moved and ...
Particle disappears if it is using PSA_Velocity and setting custom time dilation 0
UE - Graphics Features - Dec 7, 2016A 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 ...
[Quartz][Device Swap] - Quartz Clock Stops when swapping Audio Output Device
UE - Audio - May 2, 2022When swapping the audio output device while running PIE or a packaged game on Windows, Quartz clocks stop. Does not repro in Release-4.27, but can be reproed in Release-5.0. ...
Reimporting a static mesh will cause some values to be reset back to defaults
Tools - Jul 5, 2017Reimporting a static mesh will cause some Static Mesh Editor values to be reset back to defaults. This was reported as JIRA UE-22205 back in 4.10 and was marked fix in 4.12. However, I wasn't able ...