Unreal Engine Issues

Expandable Area does not respect scrollbox boundaries unless set to fill

There is an issue where Expandable Area does not respect scrollbox boundaries unless set to fill. This occurs when the scrollbox is a child of another component. This issue does not appear to be a r ...

Crash Occurs When Actors are Attached Across Persistent and Sublevels When Levels are Saved

Can attach actors to each other through the use of sequencer even though actors are in different levels which leads to crashing when saving and changing levels F3DAttachTrackEditor::IsActorPickabl ...

[Rhino Reimport] - Scaling an object inside rhino and re-importing in Unreal dup staticmesh actors

DirectX Tesselation Crash

Per UDN Licensee: I have 2 crash repro when enabling DirectX12, both linked to tesselation and still present in 4.18 stock engine and easy to reproduce. Crash 1 -Start editor with DirectX12 -Cre ...

Landscape Change Component Size Tool removes foliage from landscape

Foliage painted onto a landscape will disappear when Sections per Component is changed from 1x1 to 2x2. Affects 4.17.2 CL 3658906, 4.18.2 CL 3794801, 4.19 Main Possible Workaround is to set the Re ...

UWorld::RemoveFromWorld does not check Pointer Reference for null before use

The code in UWorld::RemoveFromWorld that removes Pawns that are about to be streamed out does not check to see if the pointer that it sets is null prior to using it. In cases where Pawns are rapidly ...

Possible incorrect pointer manipulation in BeginPackageCacheForCookedPlatformData

In UCookOnTheFlyServer::BeginPackageCacheForCookedPlatformData(), there is a pointer to int32 called CurrentAsyncCache that is used as an index. It's value is dereferenced before it is checked, but ...

Sequencer spawned blueprint functions/variables not firing with correct values on begin play

Created in relation to https://udn.unrealengine.com/questions/405764/is-it-possible-to-set-sequencer-spawnables-propert.html Issue relates to behavior of the Event BeginPlay and the propagation of ...

Image widgets need to be invalidated (once) before material parameter can cause changes

The cache for images inside of an invalidation box needs to be invalidated at least once before changing a parameter that is applied to the material of the image will have an effect. ...

Material Editor Tooltips for Sine and Cosine Expressions are Incorrect

The tool tips for Sin and Cosine within the material editor need to be modified. The tool tips are inconsistent and do not match the information in official documentation. [Link Removed] ...