Unreal Engine Issues
Unreal Engine Issues
Converting a function with local variables to an event crashes editor
UE - Gameplay - Blueprint - Dec 9, 2020When converting a function with a local variable to an event, editor crashes. Issue does not occur in 4.25, therefore a regression. ...
Raytraced lights with Source Length > 0 behave incorrectly with Megalights
UE - Graphics Features - Ray Tracing - Mar 26, 2025When Megalights is enabled, light can leak into areas that should be occluded for lights with smallish (5.0) source length and source size. [Image Removed][Image Removed] This was taken with r.Ray ...
A Function whose declaration is in a platform specific "If" block cannot be bound to a delegate
UE - Foundation - Core - Jun 3, 2016Functions whose definition is in a platform specific "if" block cannot be bound to a delegate and also causes an assert when beginning to play in PIE for the first time since compiling, but the asse ...
Play Media Player Node Causes Blueprint Functions to be Uncallable
UE - Gameplay - Blueprint - Feb 23, 2016This only occurs in standalone or a packaged game Having a Play Media Player node in a blueprint causes all of that blueprint's functions to become uncallable. Found in 4.11 Preview 5. Reproduced ...
Changing Area Light Settings In Blueprint Causes Crash
OLD - Enterprise - Aug 27, 2018Changing area light settings in blueprint will Cause a crash. Found in 4.20 CL# 4302132 and 4.21 CL# 4307852 Unable to test in 4.19 due to provided project being in 4.20 ...
UHT fails when building in VS if a function tries to return a UEnum pointer
UE - Foundation - Cpp Tools - UnrealHeaderTool - Mar 7, 2018UHT will fail during build in Visual Studio if a function tries to return a UEnum pointer. Adding a valid keyword before the return type will compile successfully. ...
Duplicating Interface functions causes the Input/Output values to duplicate twice
UE - Gameplay - Apr 27, 2018When duplicating an Interface function, the values for Input/Output are doubled or tripled. ...
Opening Materials and Material Functions with Vertex Interpolator node Results in Crash
UE - Graphics Features - May 23, 2018Per Licensee: Hello, We are migrating our project from 4.18 to 4.19.2 and we are encountering various crashes while opening our material and material functions. I'm adding a simple test case here. ...
Creating External Curve for a function's local struct variable causes editor to crash
UE - Gameplay - Blueprint - Sep 6, 2016Defining a FRuntimeFloatCurve inside a code based struct causes the editor to crash if the struct is added as a local variable to a blueprint function and the "Create External Curve" button is press ...
UObject Macro Libraries cannot use functions that require a WorldContext
UE - Gameplay - Blueprint Editor - Jan 11, 2024If you make a Blueprint Macro Library that derives from UObject you are then unable to use any functions that require a WorldContext, like Delay. This is because the WorldContext cannot be assumed l ...