Unreal Engine Issues
Unreal Engine Issues
Branching Points in a Montage Affect the Rotation Outcome of Root Motion
UE - Runtime - Animation - Mar 28, 2025When playing Montages with Root Motion, the sub stepper extracts root motion transform in small increments. If a Branching Point exists within the interval being extracted, the extraction range is s ...
SetGamePause does not affect Sequencer pause if using audio clock as source
UE - Audio - Sequencer - Oct 24, 2025We’ve run into some unexpected behavior when combining SetGamePause(true) with Level Sequences. When calling SetGamePause(true) while a Level Sequence is playing, the visuals pause correctly, b ...
Cooker is asserting in Class.h on UE 5.7.1
UE - Core - Systems - Dec 18, 2025From the linked EPS case: ---------------------------- In UE 5.7 there were some changes to how Enum member names are stored. This change introduces an assert when cooking using the Editor Debug e ...
Having a block in layout before switching to overlay strategy affects the overlay output.
UE - Runtime - Mutable - Mar 5, 2026Issue: If "Resizable" Layout Strategy contains a block, it will influence the "Overlay" Layout Strategy. Expected behavior: When using "Overlay" Layout Strategy, it should disregard whatever the "R ...
Crash upon diffing Blueprint that was reparented when its previous parent has already been deleted
UE - Gameplay - Blueprint Editor - Sep 20, 2017When attempting to diff a Blueprint that has been reparented when the previous parent no longer exists in the editor, a crash occurs. The crash is due to the editor attempting to reference the delet ...
Crash Importing Skeletal Mesh LODs with a lot of morph targets
OLD - Anim - May 18, 2016Crash Importing Skeletal Mesh LODs with a lot of morph targets Error message: Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 785] Array index out of bounds: 2 from an ar ...
[CrashReport] UE4Editor_Engine!FTexturePlatformData::GetNumNonStreamingMips() [texturederiveddata.cpp:1260]
UE - Graphics Features - Apr 10, 2017Was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below. Error message: Assertion failed: Mips.Num() > 0 [Link Remov ...
[CrashReport] UE4Editor_Engine!FRepLayout::InitFromObjectClass() [replayout.cpp:2211]
UE - Gameplay - Blueprint - Apr 19, 2016This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below. Error message: Assertion failed: Property->Proper ...
Crash Re-Importing animation with Additive Layer Tracks after adding a bone to the hierarchy
OLD - Anim - Feb 13, 2017Error message: Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 633] Array index out of bounds: 68 from an array of size 68 Source Context: 733 734 Extrac ...
ContentExamples: Physics Level Multiple misspellings
Docs - Samples - Jan 19, 2017Physics Example 1.1 "StaticMesh" is one word The word Static Mesh is 2 separate words in unreal documentation https://docs.unrealengine.com/latest/INT/Engine/Content/Types/StaticMeshes/ ...