@jonah Do you know why this might be happening? I’m seeing the same thing use furrr::future_map. I fit fine and I’m able to extract posterior samples fine but only if I don’t do that in parallel as well. So if I have a list of fit objects and run something like furrr::future_map(list_of_fits, \(f) spread_rvars(f, x[i])) I get errors that the csv files cannot be found.