Unreal Engine Issues
Unreal Engine Issues
FBX animations generated under fractional framerates fail to import
UE - Anim - Runtime - Aug 24, 2022We now have the following error that is generated in FFbxImporter::ValidateAnimStackif (!FMath::IsNearlyZero(SubFrame, KINDA_SMALL_NUMBER) && !FMath::IsNearlyEqual(SubFrame, 1.0f, KINDA_SMALL_NUMBER ...
Niagara color picker user parameter preview no longer updates until confirmation
UE - Niagara - Apr 18, 2025Starting with UE 5.4, the Color Picker Tool no longer updates preview values in real time for certain editor windows like Niagara when working with User Parameters. This behavior is a regression fr ...
If shot track ends short of the Master Sequence length, all actors return to default state
UE - Anim - Sequencer - Oct 14, 2016If shot track ends short of the Master Sequence length, all actors return to default state. This becomes an issue when you need the actors manipulated in Shot 1 to maintain their "end state" into s ...
Crashes when attempting to use an Instanced Struct inside Control Rig / Rig VM
UE - Anim - Rigging - Control Rig - Mar 17, 2025Currently, the Control Rig Editor allows the user to use the "Instanced Struct" type, for example for a variable or function input/output. However, this type does not seem to be properly supported ( ...
Functions are called multiple times when given more than one reference
UE - Gameplay - Blueprint - May 2, 2017Functions are called multiple times when given more than one reference. The function is called a number of times equal to the number of references that it is given. ...
MotionWarping does not recognize new MontageInstance with the same montage
UE - Anim - Gameplay - Jan 11, 2023When the same AnimMonotage is played again while moving with MotionWarping & RootMotion, UAnimNotifyState_MotionWarping does not recognize it. From licensee: The issue was that in URootMotionMod ...
[CrashReport] Mac crash - UE4Game!FShaderCache::InternalSetGraphicsPipelineState
UE - Graphics Features - Dec 1, 2017This is a common Mac crash in 4.18. It occurs in Game mode, not in Editor. Users have not provided any descriptions of their actions when the crash occurred. Callstack from Log[2017.11.21-20.30.4 ...
Crash Clicking on Enum in BT Decorators After the Enum Has Been Altered
UE - AI - Apr 5, 2017Clicking on a Behavior Tree decorator that references an Enum blackboard key will crash the editor if that Enum has been altered in the method described in the repro steps. If you set decorators to ...
[CrashReport] Mac crash - UE4Editor-Slate.dylib!SMenuAnchor::SetIsOpen()
UE - Platform - Apple - Sep 14, 2017This is a common and longstanding Mac crash that has occurred since at least 4.11 and affected more than 40 users. Users have not provided any descriptions of their actions when the crash occurred ...
Distant paint/scatter grass not rendered in PT exports
TM - Rendering - May 5, 2025Reported in SF [Link Removed] In TM 2025.1.1, in PT renders with large amounts of scattered or painted vegetation, distant grass may not appear in exported renders that would previously appear in t ...