Unreal Engine Issues
Unreal Engine Issues
Editor crashes if a data table containing an attenuation settings struct
Tools - Apr 19, 2016Editor crashes if a data table containing an attenuation struct is opened in the data table editor. Frequency: 4/4 Crashreporter: [Link Removed] Regression? (No), issue (does) occur on 4.10.4 ...
Duplicating Level With Large _BuiltData File Results in Editor Crash
UE - Foundation - Core - Jun 7, 2018Trying to duplicate a level in the editor that has a large _BuiltData file results in a crash. In the case of the supplied test level, it is over 3 GB. Crash repros in 4.19.2 and Main (CL 4115885). ...
Unexpected behavior from moving multiple widget components with render transform
UE - Editor - UI Systems - May 10, 2017Unexpected behavior occurs from moving multiple widget components with render transform applied to them. The individual components seem to change relative position or rotation when being clicked and ...
Unable to select foliage by left clicking after 1.5 k foliage meshes placed
UE - World Creation - Worldbuilding Tools - Foliage - Aug 28, 2017When using the foliage tool, once the mesh count reaches around 1.5k and higher you will be unable to select individual meshes by using the mouse. The lasso tool and the select all tool work as inte ...
The socketbuilders do not properly join multicast groups on iOS
UE - Networking - Jul 26, 2019On iOS, using the code in the UDP socketbuilders causes the sessions tool to not join with iOS devices. Giving the error EADDRNOTAVAIL. If the user falls back to the other code function that uses th ...
NormalizePackageNames() should interpret 'exclude developer folders' to also exclude packages in ExternalActors and ExternalObjects
UE - CoreTech - Oct 14, 2022In NormalizePackageNames() (PackageUtilities.cpp), there is a PackageFilter parameter, which can be set to exclude developer packages (NORMALIZE_ExcludeDeveloperPackages). The code only checks the b ...
Placing a section at the end of montage is not properly handled
UE - Anim - Gameplay - Feb 24, 2024Placing a section at the very end of a montage with no duration or animation assigned after it is not properly handled. Normally sections with 0 length are skipped and search continues since they ...
FAnimMontageInstance::SetNextPositionWithEvents can trigger all notifies on a montage/sequence
UE - Anim - Runtime - Jun 24, 2025This issue happens when Sequencer loops a dynamic montage. FAnimMontageInstance::ForcedNextFromPosition is set to 0 and ForcedNextToPosition is effectively the delta time. However, FMontageSubStep ...
Crash when exporting Static Meshes as an FBX (UE4Editor-SlateCore.dll!SWidget::OnQueryShowFocus)
Tools - Sep 21, 2017Possibly related to [Link Removed] ...
Crash on Device when Deploying Mobile Project with Modulated Shadows and Planar Reflections on iOS 9
UE - Platform - Mobile - Jan 6, 2017A crash occurs on iOS when deploying the licensee's project using iOS 9 version. The crash does not occur when deployed to a device using iOS 10 version. They believe the crash to be related to Pl ...