No spies availble in the unit build after building Scotland Yard

[Aleksadr]

I am in a multiplayer online game. Huge, continents, 9 AI. We are up to the year 1700. I had built spies in our last game session. I have four spies running around in the game. I was going to build a few more spies this session but to my amazment spies are not one of the units displayed in the build queue. This is in the city with Scotland Yard. The spy should show up in the build queue as greyed (dimmed) out in all of my city's build queues but they are not displayed at all. What is the deal? Hopefully i'll get them back on the next session when we reload our game.

 

[MrCynical]

You're allowed a maximum of 4 spies per civ. There's a similar limit on missionaries. You won't be able to build another until you lose one of the existing ones.

 

[Aleksadr]

Well dang.