Unreal Engine Issues

Crash playing a HapticFeedbackEffect_Soundwave with no sound assigned

Crash attempting to use a HapticFeedbackEffect_SoundWave with no sound set on it (i.e. a newly created one.) Found on: 4.13.1 Binary CL-3120228 //UE4/Release-4.13 CL-3123398 Similar to [Link Remo ...

Inconsistance Line Trace behavior

Line trace component appears to return a hit result even when the trace should not have had anything to hit. Attached project shows line trace start & end points. Even when the trace doesn't overla ...

Engine crash from opening level bounds blueprint after project reopens

There is a crash that is occurring when a blueprint with the parent of "Level Bounds". The crash occurs when the project is closed and reopened. Opening the blueprint immediately after it was create ...

Changing LODBias on landscape sections causes grass type placement issues

Changing LODBias on landscape sections causes a grass type placement issues. The grass will be floating and rotated incorrectly. Found in 4.18 CL# 3832480,  4.19 CL# 4033788, 4.20 Preview 1 CL# 4 ...

Enabling Skeletal Mesh 'Per Poly Collision' crashes the Editor

When a Skeletal Mesh isn't assigned, enabling Per Poly Collision on the Skeletal Mesh Component causes the Editor to crash. This issue was reported and tested in 4.20.1 (CL-4233996). This issue was ...

Sequencer 3D Trajectories run very slow on deep hierarchies

Using a Level Sequence with deep hierarchies causes the FPS to drop to low numbers when they are all selected within the Sequence. This is a regression from 4.19.2 (CL-4033788). This issue was repo ...

If use with mesh particles or use with niagara mesh particles is checked in the Usage flag of the material and the material domain is set to volume, compile error will occur.

[SM5] /Engine/Private/VolumetricCloud.usf(118,33-53): error X3018: invalid subscript 'VertexId' This is happening in VolumetricCloud.usf, but it seems that I can avoid the error by adding the follow ...

Windows Game Input - DualSense/DualShock controllers DPad button repeat events behave unexpectedly

AutoReimport can kick in too early for files that are being written out continuously

When exporting a large file, due to the way the auto reimporter only checks for the number of changed files has remained stable for some given threshold, it can kick in too early even though the sin ...

Crash on iOS loading into a scene with Media Framework assets

Following launching a packaged Media Framework project, the application crashes. Different behavior is observed between iOS versions. When tested in 7.1.2, the video played in the scene for a few s ...