This WFS link details a study on the effects of nutrient timing on muscle and strength increase. Could be of use to those practicing IF that still want to ensure gains in strength and/or size. It supports the notion that you would workout in the middle of your feeding period to maximize nutrient uptake. DeVany may have different ideas as I believe he likes to wait a while after training before he eats. Subjects were using creatine in addition to food.
For me personally, my schedule of eating and training is fairly random, but if I work out in the am on an empty stomach I don't seem to suffer. I definitely prefer eating a meal within an hour of lifting though.