Then, When I open a new file, in the viewports I can’t see anything. If I draw something and select all, I see from the select count that there is something there but nothing visible.
What is the version of Mac V5 is still on your system?
Back some time ago, a service release for V5 was required so both V5 and V6 could use the same PLIST.
The first time I had a problem was when I first installed, replacing V5. Then I reloaded V5 so I could work for the rest of the day. Next day V6 worked, although any time I would copy and paste or insert a block it took up to a min to complete the command. Then today I went back to work and V6 acted the same as when I first installed, can’t open existing files and new file viewports are all white so can’t see anything in them.
Most look related to (two different?) anti-virus softwares. I’m not sure this is related to your issues, but I would like to rule them out, because I don’t see any other red-flags in your information.
I’m curious what happens when you boot to safe-mode (which disables these extensions until you reboot). Does the problem go away?