Zoo Tycoon 2

[Elleian]

I received the game zootycoon 2 for xmas. I installed trouble free but have ran into several issues while advancing in the game.

I had acquired a theme after completing the African adventure and saved it when I was done yesterday. Then this morning the theme is back but I can only use the buildings and such that I had already used for the zoo. None of the choices are there for different buildings ... paths .. etc. It shows I completed the campaign and it is unlocked. But I don't understand why I can't add anything else to it in that theme.

Does anyone have any suggestions as to what I could do to get it back .. other than uninstalling and starting over?

Thanks
Elle