Hi all,
Mudcrab is doing in the correct way. Always be careful with the imported data when you are working with ZW3D 2018 or previous version.
I'd like to introduce some useful commands when such problems happen.
1) "Fix Objects" and "Clean File"
Both of the commands can delete the invalid index, small errors, unreferenced labels, and other small problems of the data. Normally you can eliminate the slight problems after applying them.
2) "Recover Faces"
In the "Data Exchange" tab, you can find the command "Recover Faces". This is a powerful tool to help heal the geometry, especially an imported one. In your case, after applying "Recover Faces", the History can work normally.
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