You know, I'm no brewing expert by any means, but that temperature sounds fine to me. Did you make a starter? I've heard that if you ferment the starter at a radically different temp than what you ferment the wort at, you can "shock" the yeast, causing a lag period. For what it's worth, I'm still in the midst of a long, slow primary fermentation with an american pale ale I brewed a week ago. It took a long time for airlock activity to kick in and at it's peak (which lasted three days) there was only one bubble per second- nothing like the fast and furious fermentations I'm accustomed to. My beer is in a closet with a constant temp of 64. You're getting some bubbling, right? I'd give it some time and check the specific gravity in few days to see how you're doing. I'm sure you'll be getting some words of wisdom from some folks far more experienced than I am shortly...
