I too, have the same issue RE: cold corner up on the south-west corner of my 2nd flr master bathroom....been like that since the day we bought the house...asked my next door neighbour (same house blueprint, mirror image, built by the same contractor), same deal.
also: it's the very same corner where there are 2 security (bathroom on 2nd floor) windows meet the corner post. While I must admit that these double-glazed vinyl windows are by no means better in terms of thermo-insulation qualities, nevertheless: all other vinyl windows throughout the rest of the house have not exhibit similar temperature difference.
It's approx 7C difference based on my non-contact thermo thermometer readings. W/o knowing exactly how this was insulated.
I am very tempted to cut a corner of the sheetrock this coming summer to inspect the insulation qualities/properties of it.....not sure if I can do a good enough patch job to conceal the cut afterwards though....oh well, I just have to try..
Q.
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