Access to Uranium not allowing destroyers

[Hamsterman]

Since I installed Warlords, I have not been able to build destroyers so long as I don't have oil. I DO have access to uranium but for some reason it's still greyed-out as though I don't (and yes, it is mined and with road). Any ideas?

EDIT: Upon further analysis, the uranium isn't even showing up in my city windows as a resource I have... which would suggest that at a later stage in the game, I won't have uranium for anything else that needs it either. Anyone else having this issue?

 

[Artanis]

Are you sure you haven't traded it away to somebody?

 

[Jaybe]

I have read that to use uranium to power your combustion shipping, you now need to have researched fission.