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Had this issue recently - only thing I could get to work was remove the pads, hold a tyre lever against one of the pistons and pump the brake lever a couple of times to focus all the hydraulic force on freeing the other piston.
Freed it up, but don't pump too many times as fluid starts to leak out if the piston comes out too far.
(This might be a terrible way to do it but worked for me).
abr
edscoble
Finally decided to pop in new pads on my mtb. Buggered if I can get the pistons to recess enough to give me more than the width of a fag paper between the pads. Tried large screwdriver, tyre lever etc - against the pistons direct and using the old pads. They seem to be properly stuck (avid elixir 3).
Anything else I can try before heading to lbs?