Pauline Bray: Have you tried to save your build map? the button might be clickable then, if not press load after the save, that worked for me.

The map is not quite playable since it stalls after the first turn which is know but you can fly around your newly created map and see how it renders :)

MarcOsi: I have to admit it was my error entirely. It wouldn't allow me to do so since I hadn't saved it. I then tried to save it, which it wouldn't do since my keeps were all too close (which is an extremely useful feature for a noob like myself). After I successfully saved it, I got it to load.

Thanks for your response but it was completely my bad. :D