Unable to research artillery

Hi,

I am new to this game and I like it a lot. Though I have a problem, I am doing 3 maps atm and in neither am I capable to research artillery. I suppose this is a bug since I can produce artillery in one game (1,315,449).

So, what to do? Will the adm fix this?

Thankful for an answer and thanks for a great game

Andreas Ekman