Unreal Engine Issues

Static Mesh 's Light Map Coordinate Index set to 4 and execute a light build, the result will be incorrect.

Light Map Resolution is set to a small value (4 or 8), it will build normally. ...

Memory Leak during video playback when main thread blocks

Video frames are stored in a queue that keeps growing until the main thread ticks again. Can also be reproduced by playing video then clicking the import file button and leaving the file import dial ...

Calling "GetCameraImage" rapidly ~10 times causes ARKit camera feed to stop updating

If you call the "GetCameraImage" function rapidly ~10 times, it causes the ARKit camera feed to stop updating.  Waiting for awhile or tapping some more seems to bring it back.   Tested on macOS H ...

Crashes when copying an array of actors that implement an interface into an array of interface references

When assigning an array of actors that implement a specific interface to an array of the specific interface the engine crashes. This doesn't happen if the actor array is put through a for each loop ...

Asynchronous Image Loading from Disk Documentation leads to memory leak

The documentation example to create your own asynchronous image load from disk results in a memory leak that is noticeable using the task manager.  ...

Editor Crash when trying to get Color data from Vertex buffer

When attempting to get the vertex color of an instance of of a static mesh that is painted after placing it in the World Viewport. The Editor crashes returning an "Unhandled Exception". The cause o ...

Branching Point Invalidates looping section settings

Lighting channels on static mesh doesn't change correctly at runtime

If call SetLightingChannels in blueprint to set a static mesh's lighting channels at runtime, the mesh in the viewport seems can't update to the new lighting channel setting.  A weird thing is, if ...

Mac - Xcode fails to build C++ project with a Shell Script Invocation Error

This does not occur in 4.25.4 Binary and is a regression. ...

Animations are not recorded correctly when "Save Record Assets" is enabled.

If I disable "Save Record Assets", all animations are recorded. I have checked the implementation of bSaveRecordedAssets, but I am not sure if this is the intended implementation. ...