Help! Shaded and wireframe display modes

Suddenly my model looks like this in shaded and wireframe mode:

It still looks fine in some of the other display modes (pen mode for example). How can I fix this? I think it happened while I was trying out the clipping plane. Deleting the clipping plane doesn’t fix it.

Hi - Please run the Rhino SystemInfo command and copy-paste the result here.

Does this only happen with that specific file?
Have you tried restarting the machine?

Hi! Thank you. Restarting the machine (again - I had tried that once) helped! Don’t know what happened, but my MacBook is very old and tired.