After 15 or so condensation free nights in my BD One Shot, my luck ran out on my last trip. It was also the first night I used this tent in sub freezing temps. I woke up with soaking wet/frosty walls. Had one of the two windows open. Light snowfall during the night. Overnight low was 22 degrees F. I had no way to measure humidity.

I had read that freezing temps will cause ice to form in the pores of W/B fabrics which of course prevents the escape of water vapor. That's probably what happened to me.