Hello,
have issue with fbx file exported from Archicad 21 (Windows 10 3D viewer is able to import and show), file is here for testing:
Many thanks Jiri
Hello, I have sent this file to the tech team, and I will keep you updated here 
Thanks for sharing here!
Hello, this model causes UE4 engine to crash, we think the issue cause is related to AC21 and the model: ( please try using D5-archicad plugin to sync the model to D5)
Script Stack (0 frames):
[2021.10.15-06.56.21:198][561]LogStats: FPlatformStackWalk::StackWalkAndDump - 0.012 s
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: === Handled ensure: ===
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error:
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: Ensure condition failed: NewTransform.IsValid() [File:C:/d5render_ue426/Engine/Source/Runtime/Engine/Private/Components/SceneComponent.cpp](file:///C:/d5render_ue426/Engine/Source/Runtime/Engine/Private/Components/SceneComponent.cpp) [Line: 641]
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error:
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: Stack:
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c737bba7 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c48df181 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c48c663c d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c48c8eb9 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c45823e8 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c0d2da99 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c458787e d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c4564bf7 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c52e8f7b d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c52f0350 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c1180bf1 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c118100e d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:198][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c11901d6 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c53057cd d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c530ad62 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c4c2e13f d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c4c3ae51 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c4a82313 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c0d2e23c d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7bf93193d d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7bf9469fc d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7bf946aba d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7bf959bf0 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ff7c6b4b3e2 d5_immerse.exe!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ffafd327034 KERNEL32.DLL!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error: [Callstack] 0x00007ffafea22651 ntdll.dll!UnknownFunction []
[2021.10.15-06.56.21:199][561]LogOutputDevice: Error:
[2021.10.15-06.56.21:209][561]LogStats: SubmitErrorReport - 0.000 s
[2021.10.15-06.56.22:328][561]LogStats: SendNewReport - 1.119 s
[2021.10.15-06.56.22:328][561]LogStats: FDebug::EnsureFailed - 1.142 s
[2021.10.15-06.56.22:457][562]LogD5: QueryLightTemplateRequest data_size: 6