Nexela wrote:You can try this to see if it fixes it.
viewtopic.php?f=47&t=28826

This worked; thank you!

Version: 0.14.21 through Steam, running on macOS Sierra 10.12.1. Save data at https://dl.dropboxusercontent.com/u/22031559/factorio_save.zip Log file at https://dl.dropboxusercontent.com/u/22031559/factorio_log.log No mods. Foolishly I didn't capture the log file from when this actually happened (I ...