I've emailed you the reason for the blue but i'll also leave it here in case anyone else has the same problem
The blue is coming from the glass material you are using, more specifically the fog you are using on the glass material. Set the fog multiplier to 0 and the index or refraction (IOR) should be 1 for window glass otherwise every time you looked out the window you'd see a distorted image.
Hope that helps
David 
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