If you have enabled iCloud Photo Library, and just restored your whole system from a Time-Machine backup, you would very likely see your Photos app keeps showing “Updating”, and you would not see anything in your shared albums (that’s what my system encountered). In the Console, you may see an error log message following a message of “New connection request” from cloudphotosd. The error message shows “RDErrorServiceDatabaseOpenError”.
In that case, delete the directory “~/Library/Containers/com.apple.cloudphotosd/Data/Library/Application Support/com.apple.cloudphotosd/” to force the Photos and its backend services to rebuild the internal database.
Lucas
It didn’t worked for me :/ After that it rebuild the files and keeps saying Updating…