Unreal Engine Issues

Windows FMallocTBB seems to have a memory leak

Overlapping Lightmap UVs Generated When Not In None LOD Group

Overlapping lightmaps are generated when the LOD group is not the default. Setting the LOD group to None and rebuilding lighting doesn't have the same result. Found in 4.24 CL# 10570792 Reproduced ...

Teleport only affects static mesh of destructible meshes, collision remains at original location

Teleporting a destructible mesh only transports the mesh of the object, the collision remains where it was originally located. Further, if the player runs into the collision, the static mesh will re ...

Cannot change collision on child components of blueprint in Details Pane

The child component of a blueprint cannot have their collision altered through the details pane of the main editor viewport if the child component is a sphere. All changes must occur in the blueprin ...

Inherited AnimBP properties not always working across editor restarts

In 4.11 when making changes to node properties in an animation blueprint they will not always appear to update in child blueprint instances when restarting the editor. In the attached project the l ...

Particle CPU cost highly increase at second "show" of a streaming level.

It seems that Particle CPU cost highly increase at second "show" of a streaming level. The Licensee's team sent a sample to reproduce this problem. So I put the project and wrote how to reproduce on ...

Mac Safari HTML5 Launch On - Unresponsive WASD controls while in Full Screen

I was testing launch on test for mac and wanted to see if the full screen works properly as there were issues with that before. I discovered that after selecting full screen, I was not able to move ...

Delete Unused Variables Does Not Remove Local Variables

Using the Delete Unused Variables option under the Edit tab of a blueprint does not remove local variables. Instead, it displays a "All variables are in use" error. Occurs in 4.9.2 and 4.8.3 binar ...

Modifying Collections does not batch Source Control operations

A licensee is noticing that a heavy use of the Collections system to categorize assets is causing a lot of unnecessary source control operations and generating a lot of noise for their logs. Rather ...

Viewport Gets HMD Control Not Working with Vive

When using the Viewport Gets HMD Control option in the Editor Preferences, the Vive does not seem to be able to control the viewport camera, which is what would be expected. ...