Unreal Engine Issues
Unreal Engine Issues
LevelStreamingPersistence: Crash when streaming in destroyed map actor with persisted properties
UE - World Creation - Worldbuilding Tools - Mar 6, 2026Context The LevelStreamingPersistence plugin can be used to remember and restore properties on actors and components that are part of a streamed level. Saved property values are restored when a lev ...
CRASH: Access Violation c0000005
Tools - Dec 29, 2014Crash Report: [Link Removed] UE4Editor_Core! FText::FText() + 19 bytes text.cpp:251 UE4Editor_CoreUObject! ULinkerLoad::LoadAllObjects() + 674 bytes linkerload.cpp:2524 UE4Editor_CoreUObject! Loa ...
UnkownRef Mips can cause TextureStreaming peaks during loading
UE - Rendering - Graphics Features - Mar 27, 2023UnkownRef Mips is meant to fix/workaround the problem where some textures are used for rendering but they don't have any component references them (such as texture used by PP effects) These UnkownR ...
"Literal Enum" BP node outputs wrong value when the input pin is connected
UE - Framework - Blueprint - May 17, 2024This behavior was not observed up to UE 4.19, but it can be reproduced in all versions from 4.20 to 5.4. When a "Literal Enum" node is used inside a blueprint and an enumeration value is chosen fro ...
[CrashReport] UE4Editor_PropertyEditor!SDetailSingleItemRow::OnArrayDrop() [sdetailsingleitemrow.cpp:172]
Tools - Oct 10, 2017This is a trending crash coming out of the 4.18 previews. Users have not provided any descriptions of their actions when the crash occurred. The callstack shares similarities to [Link Removed] whi ...
iOS Show External Login UI Blueprint Node fails on new iOS devices
UE - Online - Jun 6, 2019I have been trying to test iOS online subsystem functionality for my game and thought that this blueprint node was just broken. This bug will probably catch many UE4 developers that are new to iOS b ...
BlendSpace DeltaTimeRecord.Delta can incorrectly be set to zero
UE - Runtime - Animation - Apr 19, 2024It's possible for blendspaces to end up with an invalid delta time record because of how UBlendSpace::TickAssetPlayer modifies the time record. This only seems to happen with specific settings:Axis ...
Tick functions are skipped on the first frame in package build and standalone PIE
UE - Gameplay - May 19, 2025It's reported that all Tick functions are skipped on the first frame when running in packaged builds and standalone PIE. This is because both TickVisitedGFrameCounter and GFrameCounter are initializ ...
Crash on adding new element to ChaosCacheCollection if ChaosCacheCollection is open in editor
UE - Simulation - Physics - Destruction - Dec 11, 2020More ways to reproduce:In Chaos Cache Collection Editor press Add Element button (no matter when you will do this step)If in Step13 from Steps to reproduce you won't place Chaos Cache Collection Edi ...
Cook Determinism - Construction Scripts and ChildActorComponent issues with DiffCooks
UE - Framework - Components - Jul 26, 2024To step through the issue, in the -DiffOnly cook add a breakpoint to UChildActorComponent::OnRegister and UChildActorComponent::OnUnregister. It should hit 4 times:Once when LoadPackage loads the ma ...