Unreal Engine Issues

.mp4s cannot be played in default projects in UE5.

In UE4 (using DX11), WmfMedia was able to play .mp4 files by default. However, WmfMedia doesn't support playing .mp4s in DX12, which is what is used in UE5. Electra can handle playing .mp4s in UE5, ...

Creating a new theme is lost once the editor is restarted

Creating a theme is undone when restarting the editor. The .json file seems to become disassociated from the editor, the theme is reset back to the previous theme, and the new theme isn't available ...

Lyra standalone game instance crashes when Player #2 equips new weapon

Discovered while testing Lyra project for //UE5/Main - Foundation Shelf - FAssetDataGatherer Stall Fix Smoke. This issue is NOT dependent on the shelf and occurs without the unshelved files. This ...

Scene Capture 2D Generates Artifacts with Orthographic Projection of Nanite Mesh on Plane

Occurs 5/5 times: The Scene Capture 2D camera displays artifacts when the projection is set to Orthographic and a nanite mesh is projected on the Scene Capture 2D plane. ...

Using HISM with Density Scaling enabled throws an Ensure when Foliage Quality is lowered

Using HISM with Density Scaling enabled throws an Ensure when Foliage Quality is lowered. ...

[MetaSound][Editor] - The base submix toggle is ignored when previewing sounds on the MetaSound graph

The Enable Base Submix toggle is ignored in the MetaSounds graph.  If the sound is added to a level, it behaves as expected.  The Enable Submix Sends toggle works as expected. ...

Error thrown when adding an action mapping to an Input Mapping Context object

An error is thrown when adding an action mapping to an Input Mapping Context object. LogEditCondition: Error: EditCondition parsing failed: Field name "bIsPlayerBindable" was not found in class "En ...

In blueprint component details not showing after changing component class

It was noticed that after changing the class of the component and restarting the editor, the Detail panel is no longer displayed, which makes it impossible to work with it. Repro Rate 5/5 Regressi ...

When saving an emitter in the Niagara system as an asset, it crashes when overwriting an existing emitter.

Potential Memory Leak when frequently terminating and re-initializing FConstraintInstance

From User: When frequently terminating and re-initializing the FConstraintInstance, there appears to be a leak when cleaning up the disabled joint, which leads to an ever growing list that gets sort ...