I posted an update to the simulator client that will hopefully resolve any issues:
Please post in that thread if you are still encountering any issues – we’ll work to resolve them as quickly as possible.
Note that for Mac users, you should delete any version that you have and download this newest version manually to resolve any previous issues (you can keep your settings.json file though, that has not changed).
You want the “universal” client version for Mac. You will also need to install the .NET Core Runtime, and use it like before – run the program via the dotnet command. Though in theory .NET Core supports creating cross-platform executables… it just doesn’t work very well, so we’re going back to the framework-dependent version for non-Windows platforms.