Unreal Engine Issues
Unreal Engine Issues
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. ...
Instance Static Mesh element not rendered if array element is removed and another is added
UE - Gameplay - Dec 5, 2017Instance Static Mesh element is not rendered if array element is removed and another is added. The collision is still present and the instance count will still register as if the non-rendered elemen ...
Rotate about axis material node can cause Z-fighting in Niagara mesh particles
UE - Niagara - Oct 21, 2020The rotate about axis material node appears to cause z-fighting in mesh particles if they are scaled in the simulation. ...
The AND node always calculates all inputs
UE - Gameplay - Blueprint - Nov 5, 2015The AND node always calculates all inputs, even if the first input fails as False. Probably related to [Link Removed] (currently unresolved, but a Select node-specific fix is mentioned in the comme ...
Destructible doesn't return Impulse data on hit
UE - Simulation - Physics - Destruction - Aug 19, 2016Destructible doesn't return Impulse data on hit User Description: I'm working on a project with destructible structures. I'd like to apply damage to actors that are hit by fractured destructible m ...
ULevelSequence trying to duplicate a REINST_ class when creating new custom binding in ConvertOldSpawnables()
UE - Framework - Blueprint Compiler - Jul 23, 2025The assert that we're hitting is:Cannot replace existing object of a different class. New Object: /Engine/Transient.REINST_BPC_NPC_VFX_C_230 /Game/Maps/[REDACTED]/Levels/[REDACTED]/LevelSequence/ ...
Static imported as skeletal removing material IDs with some FBX
Tools - May 27, 2016Static imported as skeletal removing material IDs with some FBX. This user's FBX files are, so far, the only ones that exhibit this behavior ...
Toggling ULevelStreaming::bShouldBeVisible causes replication errors
UE - Networking - Mar 17, 2017Looks like the replication system doesn't properly account for bShouldBeVisible. Once a level has be marked bShouldBeVisible=false on the server, the level is completely cleaned up and all actor cha ...
[CrashReport] UE4Editor_Engine!FShaderCompilingManager::LaunchWorker() [shadercompiler.cpp:1573]
UE - Graphics Features - Aug 21, 2017This is a common and longstanding crash that has occurred since at least 4.9. The issue appears to be due to missing ShaderCompileWorker.exe in binaries, but many of these crashes occur in the vani ...
Component Array doesn't update properly when using Text Variables
Tools - Sep 19, 2018A Component Array doesn't update properly when using Structure Variables. Any array elements added after the setup don't get printed when the event is called. If you set the "Editable when Inherited ...