Unreal Engine Issues
Unreal Engine Issues
Engine no longer compiles after backporting RHI thread improvements and crash fix
UE - Rendering Architecture - RHI - Apr 24, 2025Unreal Engine 5.4 code will no longer compile after applying both the RHI improvement code changes as described in [Link Removed] and the fix for the crash described in [Link Removed]. The compilati ...
Undo, Redo, Undoing a blueprint actor Replace action causes a crash
Tools - Aug 4, 2016Undo, redo, undo after issuing a replace actor action causes the editor to crash. Found on: //UE4/Release-4.13 CL-3078131 Crash reporter: [Link Removed] Regression from //UE4/Release-4.12 CL-3053 ...
Editor Crash when custom Enum is used as Set or Map container type
UE - Foundation - Core - Mar 14, 2017Making a blueprint variable a container (a Set or a Map with the Variable's "Pin Type" set to a custom Enum) and restarting the editor causes the editor to crash when opening the blueprint. Note: O ...
Crash when creating a key in a blackboard with a name longer than 1024 characters
UE - AI - Mar 21, 2017Black board key names that are longer than 1024 characters will cause a crash ...
Crash occurs from change of inner struct value with TMap variable of outer struct
UE - Gameplay - Blueprint - May 22, 2017A crash occurs from the change of inner struct value with TMap variable of an outer struct. This crash does not occur if you change the variable type as a substitution for the last step. Regression ...
Mesh reduction crash with asset imported using FBX Scene Importer
UE - Graphics Features - Nov 30, 2016The editor will crash when using Mesh Reduction on an asset imported using the FBX Scene Import options. This same asset will not crash the editor if it has been imported using the normal Import opt ...
Crash when using StaticDuplicateObject with mismathced Source and Destination class types
UE - Foundation - Jun 19, 2025Starting in Unreal Engine 5.4, StaticDuplicateObject internally switched to using Unversioned Property Serialization (UPS) for performance reasons. However, UPS assumes the source and destination ob ...
Crash when opening the editor on Mac
UE - Graphics Features - May 26, 2017The editor will crash when it is opened on a Mac machine. ...
'Get Distance Along Spline At Spline Point' Causes Crash
Tools - Jul 28, 2018User reports that the reason for the crash is that because UpdateSpline is false on the AddSplinePointAtIndex blueprint node, this line is never called [ReparamTable.Points.Reset(NumSegments * Repar ...
Blueprint editor can crash on removing one of a Sequence node's exec pins
UE - Gameplay - Blueprint Editor - Dec 22, 2023User reported that upon removing a pin from a Sequence node the editor crashed. This only happened once, so may be a multithreading race condition or there may be additional unknown factors. The cra ...