I have one of these bipolar stepper motors from Sparkfun:
https://www.sparkfun.com/products/10846
400 steps/rev, 3v, 1.7a per phase.
I attached the Freetronics HBRIDGE to a uno and powered the uno using a 12v/2a supply. The hbridge is set to Bridge VIN To Motor Power. I have the 4 wires connected such that each coil is on a single channel. (from the datasheet from sfe product page, Black+Green on one and Red and Blue on the other).
If I run the stepper at about 110-130rpm and spin for 1 revolution one way, wait 0.5 sec and return then wait 0.5s and go again then it almost works. Every now and then there is a minor skip allowing the end position of the rotation to drift a little from time to time. Not every time, but maybe one in 10 iterations of loop(). Trying to use only 9 steps and a 20ms delay to do a rotation doesn't go as well. It's more like random movement.
I've tried limiting the current 0.6, 1.2 and 2a on the hbridge. The quickstart guide mentions that the current limit is per channel, so I'm it seems to me that a 2A limit would thus need a 12v/4A power supply to give a 2A limit to each of the two channels? Any suggestions on getting just a hand full of steps working reliably very welcome, even if they are that I shouldn't be trying to drive that stepper with this configuration

One idea is to switch out to a less current hungry stepper like, 12v / 0.33A:
https://www.sparkfun.com/products/9238