macOS client keeps crashing

I also note that I show up as offline on the trade site, even when I risk it and take of /dnd to try to sell something.

Sometimes, releasing syndicate members is a reliable way to force an instant crash. I'm not sure what determines that "sometimes", but it seems to be something with some persistence. It happened with every released punk in a map, for example. (And then the next map had the terrain generator out of sync error that I usually only see with Vaal Cities when delving, so I decided it was time to stop.)