Unreal Engine Issues
Unreal Engine Issues
iOS fails during build step with OSS Facebook plugin enabled due to spaces in filepath
UE - Platform - Mobile - Feb 8, 2019When a user tries to package or launch onto an iOS device they will fail at the build step due to:[3/8] sh Unzipping: /Users/Shared/Epic Games/UE_4.22/Engine/Source/ThirdParty/Facebook/IOS/FacebookS ...
"FVector contains NaN" on packaged builds for Debug configuration
UE - Graphics Features - Lumen - May 6, 2022Customer Provided Description:This was experienced in UE 5.01 - custom installed engine (No changes to UE code, simply added the Debug build configuration, see the following command): "c:%ue_dire ...
Enhanced Input Gesture keys (Pinch/Rotate/Flick) never release after touch ends — regression in 5.8
UE - Gameplay - Input - Aug 20, 2026POST LINK: https://forums.unrealengine.com/t/enhanced-input-gesture-keys-pinch-rotate-flick-never-release-after-touch-ends-regression-in-5-8/2745006 POST BODY:Summary An Input Action mapped directl ...
[CrashReport] UE4Editor_CoreUObject!StaticAllocateObject() [uobjectglobals.cpp:2153]
UE - Anim - Sequencer - Jun 3, 2016Really close to the repro steps for [Link Removed] Same repro steps produced the following Buggs along with this one: [Link Removed] [Link Removed] Error message: Fatal error: [Link Removed] [Lin ...
LoadErrors:Warning: Warning CreateExport: Failed to load Outer for resource when moving Blueprints folder to another folder
UE - Gameplay - Blueprint - Apr 14, 2017There are 3 assets from Content > Blueprints > Missing Types that are failing to be moved over The assets are causing the warnings are:BP_NodeClassIsMissingBP_ParentClassIsMissingTypeBP_PinReferenc ...
Actors disappearing after saving a large number of modifications to world partition maps
UE - Editor - Nov 4, 2022From Licensee: "We've encountered a world partition bug where newly created actors go missing in the viewport and Outliner after saving modifications to a large number of actors. This bug is partic ...
[CrashReport] UE4Editor-Engine.dylib!bool FHighResScreenshotConfig::SaveImage<FLinearColor>()
UE - Graphics Features - Jul 27, 2017This is a common crash occurring on Mac in 4.15 and 4.16. Users have not provided any additional descriptions. Callstack from LogAssertion failed: Assertion failed: Bitmap.Num() == x * y [File:/Use ...
Half precision is not supported for OpenGL ES 3.1 Pixel Shaders
UE - Platform - Mobile - Apr 6, 2018Fix the cross compiler so half precision is supportedAdd a project setting to specify the default precision to support on ES31. Be sure the shader version takes this setting into account. — User des ...
Crash when editing Gameplay Effect containing a deleted/renamed Gameplay Attribute
UE - Gameplay - Gameplay Ability System - Mar 9, 2025When modifying the name of a gameplay attribute that is used with a modifier on a gameplay effect, attempting to remove/change the modifier causes an editor crash. This appears to be due to line 29 ...
LevelStreamingPersistence: BP added components don't persist properties in PIE until map actor resave
UE - World Creation - Worldbuilding Tools - Mar 6, 2026Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors, components and other objects that are part of a streamed level. Persisted properties are resto ...