Since today, I ran into the same bug as skipper45mn reported about using a god power, having the energy meter drop, but not getting the result. However, the Spawn Butterflies and the Hand of Bloom powers always seem to work for me, but unfortunately the rest of the powers has failed me, as said, since today (I bought the game on January the 4th and have been playing since that date).

I tried the 'work-around' given by skipper45mn (closing and opening the game) and that seems to work, but would like to know if there is going to be a more permanent solution :-)