How was the traffic density when you tried? Yesterday I used AP for the first time in traffic that was heavy, with little spacing, but fast moving (75 MPH). I changed lanes twice during the trip. Both times the turn signal failed to initiate the shift immediately, so I nudged the wheel and that did it. I figured the AP didn't like the relatively small space I was trying to move into, even though the cars in the other lane were going the same speed as I and the space I was trying to move into was not closing. This is similar to the behavior you are describing. But on my return trip I was in very light traffic on the same road, and the turn signal initiated lane changes as it always had with no problems.
No traffic at all. Actually I changed lane into oncoming traffic lane (common in Norway). When the lane painting went from short stripes, to long stripes it wouldn't let me change lanes. Smart.
I added a little clip: [video=vimeo;143521170]https://vimeo.com/143521170[/video]
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