After collecting the steering weal the ship says "Do you want to upgrade for 100 gold?". But when I click on the check mark nothing happens.
I have the same issue. I've unlocked all areas, bought at least one house from each type and have completed all tasks from the King's Whishlist, but I'm still not able to upgrade the ship.
I'm running the app on an iPhone 4 with iOS 5.1.1.
I forgot to mention, I'm running the game on chromium with Linux.
same problem here. Tried several browsers/systems (win7/chrome, ipad..), but none worked.