Hmm... Victoria Crater is working now, but I just fell through the Kaiser Crater. So I guess the bug still exists.

same problem here. just started a new career, but in the victoria crater there is no ground and my probes are falling through the floor.

This is quite similar and even more illogical. I hope they change something.

You need to forward several UDP ports to your PC:
2300 - 2305
8766
27016

(Google if you don't know how to do it in your router.) If it still doesn't work just enter your friend's IP via the "Remote" button next to the "Join" button.

Have you forwarded the related ports?

I don't know why it is so hard to... kind of create a mission with Zeus and save it. That would be a huge step forward.

At least in Altis Life I often rolled over with a truck (the orange / blue one).