Unreal Engine Issues

References stored in deleted UProperties stick around in a Blueprint Class

If a UProperty that stores a reference to an asset is deleted, the reference to that asset lingers in any Blueprints that had a reference stored in that UProperty. This can lead to issues when the r ...

[CrashReport] Assertion failure in NameTypes.h after CookOnTheFly

This is a top crash occurring for users in the 4.14 and 4.15 releases. Unfortunately no user-descriptions of the issue have been provided, so information is limited. Despite a different callstack, ...

Components lose transform values in the new instance after copy and paste

Execute pin from the Input node of a Collapsed Graph does not show the flow of execution

The flow of execution, shown while debugging a blueprint, does not show for the execution pin that comes from the Input node of a collapsed graph. It shows for the rest of the graph. Regression?: N ...

Blueprint's location reset to 0, 0, 0 after being detached in a network environment

Attaching / Detaching a blueprint actor to a player in a network environment causes location errors when the detach occurs. Even without the attach events being replicated or the blueprint's movemen ...

Black screen caused by depth of field on several mobile devices

DOF does not display correctly(screen turns black) on several mobile devices. I could repro the issue on:Samsung GALAXY S7, Android 6.0.1Xperia X Performance (F8132), Android 6.0.1 ...

Blackboard Key Values Persisting Between PIE Sessions

Values set on Blackboard Keys are persisting after stopping and starting a new PIE session. Restarting the editor sets these values back to NULL. ...

Lighting build fail due to failing to open channel for material data

Licensee reports lighting build fails for their specific levels which were created in 4.14.1 then moved to 4.15.1. Workaround: Setting LogLightmassSolver verbose level to Warning can show "Warning ...

[CrashReport] UE4Editor_Core!FGenericPlatformMemory::OnOutOfMemory() [genericplatformmemory.cpp:161]

Based on CrashVisualizer data, crashes of this nature are the 4th most common in the 4.15.1 release. This crash may be expected due to the clear messaging that the system is out-of-memory, but this ...

Attached Project Crashing on Play When Using World Origin Rebasing with World Composition

The editor is crashing in the attached project on PIE when World Origin Rebasing is enabled. According to the user, this did not occur in 4.13, but I was unable to test any further back than 4.15, a ...