Unreal Engine Issues

Screen space reflections are flickering when using no Anti Aliasing

This is a regression from 4.24.3 (CL-11590370). SSR begins to flickers when AA is disabled when moving around the scene. This was reported and tested in 4.25 (CL-13144385) and reproduced in Main 4. ...

Differences in DistanceToNearestSurface and DistanceFieldGradient results between 4.27 and 5.0

In the UE5 case, we end up seeing very harsh lines in both the gradient and the distance to nearest surface examples whereas the results in 4.27 appear smooth.  It was also interesting to observe c ...

Complex morph target motion vectors flicker

Morphing target flickers when switching between complex targets. This occurs when global illumination is set to Lumen. Per talk with analyst, it greatly improves when using SSR or None instead of Lu ...

GPU Lightmass no longer works with cascaded shadow maps

Since Unreal Engine 5.5 stationary lights have stopped working with GPU Lightmass when using Cascaded Shadow Maps. With Virtual Shadow Maps enabled on the project, GPU Lightmass works. This issue d ...

Data validation FAILED due to IWBE_Blutility containing invalid data

4.26[AssetLog] D:\Binary\UE_4.26\Engine\Content\Tutorial\InWorldBlueprintEditing\TutorialAssets\IWBE_Blutility.uasset: Default__IWBE_Blutility_C is not valid. See the MapCheck log messages for detai ...

Absolute World Position not returning the correct values in post process material after Temporal Upscale

Unable to create a 'World Soft Object Reference' Variable from the Variables Panel

Soft references to World objects (TSoftObjectPtr<UWorld>) cannot be directly created in blueprints. These types work fine in blueprints but cannot be directly created. The reason soft references are ...

Widgets added via the user created section do not update when changes are made to the child widgets

When updating a widget's settings, those changes will not be reflected in the defaults of any instances where that widget has been used. ...

Changing blueprint default values inside arrays only updates loaded child blueprints

The rules for delta serialization in UE4 are complicated, and the editor tries to hide them from you, which works 90% of the time but can lead to confusion and data loss in other situations. In the ...

Properties not converting when using Core Redirects from BP to C++ class

Note: I also tried with different variables names and property redirects. It's also hits and misses.  I tried with a bool and an integer. Only the integer will convert but not for all instances.. ...