I read your post and the first thing I said to myself was "SHOOT!!!" Why? Cause I'm still "putting my girls to bed" at night. Oh, they go in the coop just fine at dusk. I have a webcam and I've been watching them when they do go in. They stand around, looking up at the roost bar tray, looking at the nice ladder that leads up to it for them, shuffling around, looking around..drive me nuts! Then one or two of them will hop onto the ladder, looking up but never quite "getting there"....again, drives me NUTS!!
So after about 20-30 minutes of listening to them bwaaking for "mom" I give in, go out to the coop and put them all (4 of them) onto the roosting bar. They all look at me as if they're saying "what took you so long??" Chickens!!! Silly little things!