The same thing is happening with me as with rokkettaro.
I reinstalled using the tidal bootstrap (had been doing manual installs previously and had recently upgraded to the latest version of TC).
If I leave the ghci command in atom as default, I get the above error. If I manually override it, I get this:
Custom ghci path configured: ~/.ghcup/bin/ghci
Ghci command: ~/.ghcup/bin/ghci Ghc-pkg command: ~/.ghcup/bin/ghc-pkg
Load BootTidal.hs from /Users/vin/.atom/packages/tidalcycles/lib/BootTidal.hs
/bin/sh: ~/.ghcup/bin/ghci: No such file or directory
However, actually running ~/.ghcup/bin/ghci does what you’d expect and loads the Haskell interface.
I also get the SC errors mentioned above; the __MACOSX folder seems to be a symptom of the bootstrap installing SC3-plugins over an already existing installation of the same. The buffer problem doesn’t really seem to impact the loading of samples as far as I can tell. The number of loaded sample banks seems to check out, but I didn’t do a thorough count.
MacOS Mojave (latest), mid-2015 rMBP.
It is perhaps worth noting (though can’t imagine it makes any difference), that I’m not using bash for the terminal? Tryin’ to give as much info as possible.
I have a feeling that something else is going on though, because a few months ago (November 2019) Tidal was running like a dream. I didn’t touch since maybe early December, went to have a play this evening and Atom wouldn’t boot Tidal at all, so I did an update on the package and on Tidal itself, and now here we are. At least getting error messages now?