I’ve never seen section planes disappear without them being deleted by the user. Is it possible you are looking at an older file? Can you share the .skp file? I don’t know if there’s anything to see but maybe…
I have this problem with my SU 2022 model. Here is a video showing the problem.
I have as follows
Device name HP-Z800|
Processor Intel(R) Xeon(R) CPU E5520 @ 2.27GHz 2.26 GHz (2 processors)|
Installed RAM 24.0 GB
System type 64-bit operating system, x64-based processor
Display adapter is NVIDIA Quadro 2000
The model on the 3d warehouse. I thought I could share it privately but it seems it needs to be public. I had changed that but when I looked again there seems to be a problem re-rendering the model. I’ll keep checking back to see if it finishes. I may have interrupted it after uploading it because it took so long.
The common clipping issue is when the camera is basically inside the model.
To fix it in that scene I:
Orbited the camera so I could see the model.
Turned off the tag for the Existing Terrain and Survey and created one for the OS Map which I also turned off.
Aligned the view with the section plane again.
Turned the Existing Terrain tag back on.
Updated the scene.