Unreal Engine Issues
Unreal Engine Issues
HotReload fails with Linker errors when using Visual Studio 2017
UE - Foundation - Core - Apr 24, 2017I had a tester with VS 2015 run through the steps I failed with, and they were unable to repro. JamesF was able to repro the issue on VS 2017. JamesF pointed out that this does not occur is you cho ...
'Get Distance Along Spline At Spline Point' Causes Crash
Tools - Jul 28, 2018User reports that the reason for the crash is that because UpdateSpline is false on the AddSplinePointAtIndex blueprint node, this line is never called [ReparamTable.Points.Reset(NumSegments * Repar ...
Unable to save Blueprint Function Library if it references a string table entry
UE - Editor - UI Systems - Localization - Apr 4, 2019Regression. Function library saving crashes if it references to a string table entry. ...
Nullptr Ensure and crash after HotReloading
UE - Foundation - Core - Jan 26, 2017Following my repro, I hit an ensure and crash. The two times I tried to repro after my first crash resulted in different call stacks. I'll comment the other Jiras once I have them in. One of my cra ...
Enabling bUpdateComponentTransformToRootBone in a GeometryCollectionComponent causes broken particles to appear in the wrong location
UE - Simulation - Visual - Jun 22, 2025Enabling bUpdateComponentTransformToRootBone in a GeometryCollectionComponent causes broken particles to appear in the wrong location. When that flag is true, the moment the GeometryCollection (GC) ...
Possible incorrect pointer manipulation in BeginPackageCacheForCookedPlatformData
UE - Foundation - Core - Cooker - Dec 12, 2017In UCookOnTheFlyServer::BeginPackageCacheForCookedPlatformData(), there is a pointer to int32 called CurrentAsyncCache that is used as an index. It's value is dereferenced before it is checked, but ...
Editing parent emitters with mesh renderer in a niagara system causes crash
UE - Niagara - Nov 9, 2021After editing the parent emitters of a Niagara system with mesh renderer particles the engine will crash the next time the editor and system are opened. This was tested with both engine content cub ...
Unable to build marketplace code plug-in
UE - Foundation - Cpp Tools - UnrealBuildTool - May 17, 2022Fix for [Link Removed] sets the RuleAssembly in the Marketplace plugin to ReadOnly. This has prevented the plugin binaries from being compiled. Change the readonly flag as shown in the following co ...
When using Perforce, saving a level over another leaves the target umap file as "marked for delete"
UE - Editor - Workflow Systems - Mar 11, 2025When working on a level asset and using command "File – Save Current Level As..." to save it over a different level asset, the engine first deletes the target level (that's going to be overwritten) ...
[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 ...