We have noisy, buzzing windows. During the night, the buzzing sound is awful. We have contacted the window company who state that unless they hear it, they cannot do anything about it. Have you heard of this before?
I have the same problem ... just moved into the house this summer, and just starting last night, in the wind, its buzzing/moaning. My house is vinyl-sided, and I'm wondering if it's related to the trim around the window. Is yours vinyl sided too? What brand window is it ... I'll check mine.