I have two games running, on the first one I have collected all the pieces for the alchemy lab, and the board that you can do plans on is there. (just waiting for a master builder to use it)

but on my 2nd game i think i collected all the bits for the lab, but i don't have the board. I have a master builder on there!

Can anyone help as to why I can't get the board on the 2nd game. I'm presuming i'm missing something?

thanks, Claire