Armature,
Like I said in Post #3, you are most likely missing the 5V power to the C25 board. This can be done two ways, either by changing jumpers on the ESS to allow the 5V to flow out LPT1 and LPT2 on the ESS board so the breakout board is powered. OR, you can wire the power directly to the breakout board. The last is probably the better way because the ESS is limited by the amount of current it can supply, but in a normal setting there is not much power consumed by the C25, but if you attached items to the C25 that draw power that could add to the load so it is best to just wire the 5V directly to the C25 board as DaZ mentioned as well.
Russ