Thank you for taking an interest.
I'm at home now so maybe my message will get through.
The problem is at work. It's a powerful PC with 32 MB RAM running Civil 3D
2020 in Win 10 Pro.
When starting AutoCAD and loading a saved drawing it spends about 4 minutes
showing the little blue spinning donut, then another 4 minutes seemingly
frozen to activate the drawing. Then quitting after a save takes at least
another 4 minutes..I suspect it's the PC, not necessarily AutoCAD. Our
"IT" guy is a numbskull, so I am asking where I know the smart people are.
Yes, I have tried recovering and auditing numerous times with no reported
errors, and rebooted in between. No help there.
I use Iolo System Mechanic Pro at home, but they have nothing like that
running there.
Maybe tomorrow I will e-mail myself the drawing and try opening it here.
Thanks to Autodesk having coronated me, I have C3d 2020 on my home laptop
with 16 GB RAM.