When I first started playing I would get a notification when my ship returned, when my troops were done training, when a builder finished construction, and probably a few other things. Now I get nothing. What's up with that? I usually rely on my notifications to let me know when to log back in so I don't waste time with idle builders and full taverns.
Unfortunately we had to disable them while we have been working on the servers. Don't worry they will be back!