Hi!  zombie post time.  I made a second attempt at croissants recently and ran into trouble with the proofing phase.  As you can see, the layers are present, but nothing puffed!  I tried rolling the croissants looser and got a bit more air inside, but not nearly enough.  I proofed these ones for 24 hours in a room temperature oven.
 
	 
 
	 
	 
 
	I used the recipe from Baker & Spice (with less yeast than some other recipes, but also a preferment.  I can post the details), and the method from Sarabeth's Bakery: From my Hands to Yours.  The lamination process went fine, but the initial detrempe dough was dry and I needed to add more water, maybe overkneading it in the process?  
 
	 
 
	Ok, here's the recipe:
 
	 
 
	1 sachet fast-action yeast (7 grams is what I used)
 
	500 g strong white flour (I used all-purpose but that should have only made the dough more moist?)
 
	110 ml warm bottled water (20 C)
 
	110 ml cold milk (10 C)
 
	20 g Maldon salt
 
	70 g fine sugar
 
	250 g unsalted butter