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There's obviously a bit of mains leakage from the AC adapter, could be a danger to the electronics of the camera, as well as yourself. It's common to get leakage from power supplies, the foil lining buildings often has quite a high potential induced from surrounding wiring and TV feeds and is now required to be earthed in new buildings. If you have more than one supply involved (e.g. one for the camera, one for the G11) that could also be the cause of the problem. You could try earthing one side of the supply to ground, but be aware that some switchmode supplies don't like having their output's earthed. I would also measure each side of the output of the Plugpack to ground to see how high the voltage is.
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