Unreal Engine Issues

Cast modulated shadows causes black screen on iOS with non-default FOV

Using a FOV other than 90 with Cast Modulated Shadows seems to cause a black screen and weird FOV issues on an iOS device, in 4.9.2. If the camera has FOV=90, it works fine on the iOS device. If th ...

Costs of Static Lights on Render Thread

A Japanese developer's making a scene that has over 4000 static point lights. They thought the lights don't affect rendering in runtime. But they realized the RenderThread's costs become bigger. I ...

[CrashReport] Crash while snapping multiple actors at once

Crash occurs when selecting all actors and pressing "End" to snap them to the floor. This doesn't occur if you create a blank map and add a few actors to it. The specific conditions may need to be ...

Clearing SubUV Animation assigned texture Crashes Engine

Clearing the texture field in the SubUV Animation after creating it from a texture in the content browser will crash the engine. ...

Rotational root motion accumulation to worldspace can add invalid translation

When a character is playing an animation that contains rotational root motion and that character is placed on a moving actor, an invalid translation component is introduced to the worldspace positio ...

[CrashReport] Access violation - FBlueprintCompilationManagerImpl::ReinstanceBatch

This is a trending crash in the 4.17 Preview. Unfortunately users have not provided any additional information. There is no record of this crash occurring in 4.16.2, so it is possibly a regression. ...

WP HLOD Crash on Small Cell Sizes

When using object lit by the Indirect Lighting Cache sometimes the cache will not load correctly for movable objects when a level is streamed that contains a landscape

When setting up a scene with a persistent level and any sublevel that contains a landscape that is loaded via load stream level node in the level BP can cause the ILC to not be correctly assigned fo ...

Landscape 'crack free displacement' option causes landscape layer coords and UVs to be wrong

If you check the 'crack free displacement' option in a landscape material, it seems to break the results of both the landscape layer coords and regular UV input node. Worldposition is not affected. ...

Simulated ability tasks not being cleaned up in UActorChannel::ReplicationMap

I've noticed the issue occurring in both 4.20.3 (CL 4369336) and 4.21.0 (CL 4541578). The user on AnswerHub has also noticed the issue in 4.20.2 (CL unknown) and claims the issue did not occur in 4. ...