Title: Critical Bug – “Version Unknown” + Crash on Save (DX12) across ALL Twinmotion Versions
Hi everyone,
I’m facing a serious issue with Twinmotion and I want to know if anyone else is experiencing the same.
The Problem
I have multiple project files created in Twinmotion 2024 that were working perfectly before.
Now:
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They do NOT open anymore
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Twinmotion shows: “Version unknown”
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Files have NOT been modified recently
It gets worse
In newer versions (2025 / 2026):
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Sometimes the files do open
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But when I try to save → Twinmotion crashes immediately
Error:
D3D12RHI / DirectX 12
What’s strange
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Files from 2023 and older → open fine
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New files → can open, but saving often crashes
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After a crash → files become unreadable (“Version unknown”)
System
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GPU: RTX 5070 Laptop
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OS: Windows 11
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Drivers: NVIDIA Studio (also tested clean installs + older versions)
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Device: ASUS ROG high-end laptop
Versions tested
I tested ALL of these:
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Twinmotion 2026.1 Preview
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Twinmotion 2025.2
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Twinmotion 2025.1.1
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Twinmotion 2024.1.2
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Twinmotion 2023
Same behavior:
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Either “Version unknown”
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Or crash on save (DX12)
What I already tried (everything)
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Full clean reinstall (all versions)
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Deleted all AppData + Unreal cache
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Cleared logs / webcache / saved folders
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Reinstalled Epic Games Launcher
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Forced NVIDIA GPU (disabled integrated GPU)
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Used DDU and installed different drivers
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Installed all dependencies (VC++, DirectX, .NET)
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Forced DX11 via Engine.ini
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Switched GPU mode to Ultimate
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Tested on another machine
Conclusion
At this point, this does NOT look like a user issue.
It seems like:
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A DX12 / GPU issue
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Possibly related to RTX 50 series
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Or a file parsing issue in newer builds
Question
Is anyone else experiencing:
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“Version unknown” on valid files?
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Crashes when saving?
Would be great to know if this is widespread.
Thanks!