Smoke simulator in 2.5 bakeing option grayed out??

I keep watching these tutorials on how to do the smoke simulations, because I just decided to upgrade to 2.5. I’m doing them right and everything is ok, then I get to the point where I want to bake, but everything is grayed out so I can’t click anything…
Anyone know why this could be happening?

My guess is you haven’t saved your blend file yet. Smoke sims bake to the same directory where the blend is located, thus before it has been saved there isn’t anywhere to bake to!

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Yep! That’s why, thanx