Unreal Engine Issues

ODSC - Launching a newly created project via UnrealFrontend fails to load some materials and crashes

The same repro steps on 4.26.2 will launch the project successfully. Packaging a project once to create complete ShaderMaps will work around the issue. ...

[CrashReport] Commandlet crash - UE4Editor_Engine!FAnimationUtils::CompressAnimSequenceExplicit() [animationutils.cpp:621]

This is an infrequent commandlet crash that has affected a number of users exclusively in 4.17.1 (possible regression from 4.17.0?). There are also two instances of older cases in 4.13 and 4.15, bu ...

Editor crash with Japanese ATOK input(candidate list related)

This is probably a continuation from [Link Removed]. [Link Removed] fixed the crash with MS-IME input, but crash/instability can still happen with another Japanese input system, ATOK. ...

Network profiler crash

Running with the -networkprofiler command line argument can crash the server on the first engine tick in FNetworkProfiler::TrackFrameBegin because the file writer archive hasn't been created yet. ...

Set Morph Target not being sent to children of Inherited Mesh

In previous versions of UE4, Set Morph target to call the Inherited Mesh and would result in any children of the Inherited Mesh that shared that morph target name to morph. In UE4.9 this no longer ...

Materials using Texture 2D Arrays fail to compile

REGRESSION: Does not occur in 4.24 Materials using Texture 2D Arrays have the following errors:[SM5] /Engine/Generated/Material.ush(2225,107-114): error X3004: undeclared identifier 'Material' [S ...

Unsuccessful WP conversion when map has scripted sublevels

[Quartz][Device Swap] - Quartz Clock Stops when swapping Audio Output Device

When swapping the audio output device while running PIE or a packaged game on Windows, Quartz clocks stop. Does not repro in Release-4.27, but can be reproed in Release-5.0. ...

Reimporting a static mesh will cause some values to be reset back to defaults

Reimporting a static mesh will cause some Static Mesh Editor values to be reset back to defaults. This was reported as JIRA UE-22205 back in 4.10 and was marked fix in 4.12. However, I wasn't able ...

Selecting multiple actors with differing DataTableHandles causes data loss

The data table customization (and probably others) tries to aggressively clear out row references that are not valid in the table they point to. This breaks when selecting multiple actors or objects ...