Unreal Engine Issues
Unreal Engine Issues
Race condition whilst cooking material layers: Invalid DDC key
UE - Graphics Features - Oct 5, 2018When cooking the DDC key for a material layers parameter set may become invalid which causes issues reading/writing to the global material shader map and can lead to a crash. See original UDN post f ...
Ctrl + z still active in PIE
Tools - Jan 20, 2016Users can select ctrl + z while playing in Editor causing PIE to stop and undo last change, often freezing the editor temporarily, and sometimes causing a crash. Workaround: This does not occur if ...
Streaming of array textures with mips results in nearest mips being black
UE - Graphics Features - Jan 20, 2020The issue is discussed in this UDN:https://udn.unrealengine.com/questions/544210/crash-starting-up-in.html Key quote from UDN thread is:"Also, having made a texture array with 190 entries, it seems ...
Using a user generated timeline in blueprint causes an exception in engine code.
UE - Gameplay - May 13, 2015This crash is caused by an exception that is thrown due to the functions inside of a blueprint based off a user-defined class that is suppose to mimic Timelines. ...
Nested comments are not parsed correctly by UHT when a second UClass is declared
UE - Foundation - Cpp Tools - UnrealHeaderTool - Mar 14, 2016Using nested comments when also declaring a second UClass in the same header file causes the UHT to have issues when parsing, resulting in a crash of UHT. ...
Changing function return type in code does not update blueprint pin links
UE - Gameplay - Blueprint - Oct 31, 2016When the return value of a C++ function is changed without preforming a hot reload, instances of the function node used inside a blueprint function will have their Return Value pin updated to the co ...
Attaching capsule to Root component triggers VS Break on PIE
UE - Foundation - Core - Feb 13, 2015When a capsule is attached to an actor Root Component followed by playing in editor through VS debug mode there is a breakpoint triggered in VS upon pressing PIE. Continuing through the break allow ...
Managed particle systems can fail to be removed from managed ticking when pending registration
UE - Niagara - Mar 31, 2021UParticleSystemComponent::SetComponentTickEnabled can fail to disable ticking due to IsTickedManaged not checking if the particles system is pending registration. The crash was in part because of c ...
Hierarchical Instanced Static Mesh component instances are not duplicated correctly if the parent is duplicated
UE - Graphics Features - Dec 16, 2016Duplicating an actor with a Hierarchical Instanced Static Mesh component that has an instance will duplicate the instance as well, but this instance is not rendered. Please note, this was discovere ...
CommitMapChange doesn't fully deal with sub-levels
UE - Gameplay - Jan 12, 2017Per https://udn.unrealengine.com/questions/329206/crashes-when-streaming-levels-in-414.html When inspecting the code for this report, it has become clear that the streaming levels of the incoming m ...