Solved

None of us can join

I can't detect any problems at the moment. Were you the only person with this problem?

That sounds terrible, would you like the race re-run? I have an idea what this might be related to, but can't see anything in the system indicating why this occurred.

EDIT: Actually, now it looks like maybe the simulator your race ran on is having issues. I'll take it out of the service. I can see another race is having issues (the only one running on it). This looks like a very isolated incident which only hit a couple of races, and yours was one of them.