Evaluating same frames of event track when enabled auto scroll.

Tools - Sequencer - Feb 3, 2020

If Auto Scroll is enabled, it seems to be re-evaluating the same frame. Especially noticeable when the [View Range End Time] is small value (Working Auto Scroll). ...

Niagara Vector Field CPU access Error prevents its use in projects

Rendering - Niagara - Jan 31, 2020

Niagara VectorFields do not function properly since "Fix CPU Access" changes are not persistently saved. After every Editor restart or reopening projects, the Niagara-VectorField driven Emitter and ...

Drag and Drop Operations Don't Work Correctly When "Render on Phase" Is Enabled In a Retainer Box

Tools - Slate - Jan 31, 2020

Drag and drop operations don't work correctly when "Render on Phase" is enabled in a retainer box. When "Render on Phase" is disabled the drag and drop operations work as expected. In 4.23.1 the dr ...

Linux server builds of 4.24.0 failing due to Text3D plugin's dependencies on FreeType2 and HarfBuzz

Platform - Linux - Jan 31, 2020

The build error is descriptive. FreeType2.Build.cs and HarfBuzz.Build.cs explicitly check if they are being used for a Unix server build and throw exceptions to prevent that. Commenting out those ex ...

MAC rect light does not use assigned source texture

Rendering - Jan 30, 2020

Rect light does not use its assigned source texture on MAC OS. Tested in: 4.23.1 CL#9631420  4.25 CL#11062379 ...

Large Landscapes cause long PIE start time delays

Tools - Landscape - Jan 29, 2020

These delays appear with large Landscapes (for example 8029 x 8029) . The delays only start occurring after the level is saved and reopened. After which PIE start times will be 5 to 15 times longer ...

Attached actor in Sequencer does not detach regardless of the detach state settings until Sequencer is restarted

Tools - Sequencer - Jan 29, 2020

Attached objects in sequencer do not detach with newly specified "When Finished" property until Sequencer is restarted.  Tested in: 4.23.1 CL#9631420  4.25 CL#11062379 ...

No alpha to coverage for ES3.1 and mobile Vulkan

XR - Jan 29, 2020

MSAA is not applied to masked textures/materials. Testing blocked in MAIN 4.25 @ CL 11144351 by UE-86577 ...

Navmesh drawing is not visible during Simulate or PIE unless Supported Agents includes the first agent

Gameplay - AI - Jan 29, 2020

In Simulate or PIE it is not possible to see any Navmesh Volumes past the 1st in a multi-navmesh setup. Any Nav Volumes after the 1st need to have the 1st one enabled for them to be drawn in the Lev ...