I agree w/ Stephen. It sounds like there was something on the surface of wood - some sort of wax or film or something. This could be due to cleaning products used over time (e.g. if you ever used a product to make your floors look shiny or using improper cleaning product that has wax or oils). When this happens, a screen & recoat won't work as it won't adhere properly (and you need to fully sand floors). See this article: What is a screen and recoat.
http://theflooringgirl.com/blog/hardwoo ... -mean.htmlAs Stephen mentioned, the flooring contractor should have been able to detect this.
Bona Traffic was right product to use, esp over prefinished floors. Generally over prefinished, when you do a screen & recoat, you need 2 coats of poly (not sure if they did 1 or 2).
Also, 24 hrs is sufficient to walk on it, but I'd recommend 2-3 days before furniture returned and 2 weeks for area rugs.
http://theflooringgirl.com/blog/how-lon ... o-dry.htmlAlso, did you do any painting? And, if so were floors covered for a while. I'm guessing not based on your description, but I did see that happen one time when painters covered the floors for 2 weeks and I had someone write into my website w/ a similar story.