Updated to MacOS Sierra 10.12.5. Installed new NAS Navigator. Neither the Navigator nor the finder (using AFP) can connect. I can still connect from my old machine running 10.6.8. Thoughts or workarounds? Thanks!
Update: Used the old computer to check the settings on the LinkStation. AFP was not enabled -- enabling allowed Sierra to find and mount the disks.
Gee, thanks for your help everyone! So many helpful replies! Glad to have purchased a Buffalo product and to be a part of this so so supportive community!