If everything else you've made has been fine, maybe you killed your yeast by heating up the milk and water too much? Did you check the temp?
Also, were you using quick yeast? I'd think a one hour recipe would need quick vs regular active dry yeast.
I keep my yeast in its original jar in the fridge. Lasts just fine till I use it up!
Maybe it was the heat. I'll try it again. It called for regular. My yeast has not been in the fridge but I'm putting it there. We shall see!