Can you copy the good PDF from other computer to your computer where it is not working and check if all components are still visible ?
Check for model faults with Geometry Inspector.
Does it work without without the section?
Yes, it works without section view. One of the parts has small engravings that come out as a fault. It shouldn't be a problem because another assembly with the same part saves fine.
I would still fix the model.
Could be as easy as clicking the Heal Body Faults on the Geometry Inspector.
Or try the Inspect->Optimize.
Could be a combination of the geometry problem and the section view.