Question for you - When you took off the gypsum board, was there a vapour ######er over the insulation? If not - that's the problem. If you don't have a vapour ######er, moist air from within the house, will condense in the insulation space (actually on either the interior or exterior face of the insulation - usually the interior face), thus causing the mould problem. So once you clean up the mould (mold - is the american spelling), you need to get a vapour ######er in behind your gypsum board. You should check the rest of the exterior wall - if you don't have a vapour ######er, you have big problems.
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