UE crashes whenever I Load Recorded Data into a Level Sequence

Development Cinematics & Media
1

This worked a few days ago, now it doesn’t. I’m in UE 5.6.1. I was able to record mocap from my Vive trackers and view the animation in my Level Sequence. Now whenever I try to import it, UE gives up the ghost. I’ve reinstalled UE, tried it in fresh projects and levels, with various mocap files, with the same outcome. The Nvidia driver is up to date. I get…

LoginId:5357a30c41f86279660cde891dd0befb
EpicAccountId:f78617319ce44b768b5782ea13254a7d

Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Containers\ContainerHelpers.cpp] [Line: 8]
Trying to resize TArray to an invalid size of 4294967287

UnrealEditor_Core
UnrealEditor_TakeRecorder
UnrealEditor_TakeRecorder
UnrealEditor_TakeRecorder
UnrealEditor_TakeRecorder
UnrealEditor_Sequencer
UnrealEditor_Sequencer
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

thanks