こちらの問題についてもエラーログを見つけてきましたので添付させていただきます。
Metasequoia 4 Ver4.9.0a (64bit) is running.
Build time: Sep 7 2024 09:46:41
Windows version : Windows 10 x64 22H2 Build:19045
Number of CPU : 8
Physical memory : 32701 MB
Direct3D11 Driver: NVIDIA GeForce RTX 3060
DeviceID: 9476
SubsysID: 964498530
Revision: 161
FeatureLevel: 11.4
Exception code: c0000005 (EXCEPTION_ACCESS_VIOLATION)
Access violation at address 00007FF846236560. Write of address 0000000000000008.
Module: C:\Program Files\tetraface\Metasequoia4\libfbxsdk.dll
0x00007FF846236560 libfbxsdk.dll: fbxsdk::FbxLayerElement::SetMappingMode
0x00007FF90040700B ExportFBX.dll: MQInit + 54619 bytes
0x00007FF67C4F36E6 Metaseq.exe: MFilePlugin::Export + 150 bytes
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0x00007FF67C421A60 Metaseq.exe: TFormMain::DocumentSaveAsWithFilter + 1712 bytes
0x00007FF67C421386 Metaseq.exe: TFormMain::DocumentSaveAs + 518 bytes
0x00007FF67C145123 Metaseq.exe: MTEventClosure<PyMQWidgetCallback<PyMQButton> >::invoke + 51 bytes
0x00007FF848324B5A MTKit.dll: MTObject::invokeCallback + 90 bytes
0x00007FF84831E172 MTKit.dll: MTMenuItemWidget::onLeftButtonUp + 1218 bytes
0x00007FF84831DEC7 MTKit.dll: MTMenuItemWidget::onLeftButtonUp + 535 bytes
0x00007FF8482B84C0 MTKit.dll: MTApplication::wndProc + 6560 bytes
0x00007FF8482B6B12 MTKit.dll: MTApplication::globalWndProc + 34 bytes
0x00007FF91C72EF5C USER32.dll: CallWindowProcW + 1548 bytes
0x00007FF91C72E684 USER32.dll: DispatchMessageW + 1188 bytes
0x00007FF8482B95FE MTKit.dll: MTApplication::enterEventLoop + 510 bytes
0x00007FF8482B93F1 MTKit.dll: MTApplication::execute + 17 bytes
0x00007FF67C483E62 Metaseq.exe: wWinMain + 2290 bytes
0x00007FF67C706E36 Metaseq.exe: __scrt_common_main_seh + 262 bytes
0x00007FF91D3B7374 KERNEL32.DLL: BaseThreadInitThunk + 20 bytes
0x00007FF91DF5CC91 ntdll.dll: RtlUserThreadStart + 33 bytes