Now when you say "heating to 160f for 15 min", do you mean in the oven? Like toss it on a baking sheet and bake it at 160 for 15, or are we talking boiling or some other method?
I use BeerAlchemy as well, great program.
For all you not running Tiger it will still launch, it's just a little shakey. I use it at home (w/ 10.4) mostly, but when I'm at work (w/ 10.3) and want to add in a recipe or muck around it works as well.
Under 10.3.x it will give you a message when...