Turning on ninja skinning fixed this for me. It still sometimes skips them but it will run back and get them eventually
I'm currently at work, but I was having the same problem. Ran for a little over an hour and didn't skin a single mob. Even used remote desktop to switch CR and that didn't help. This is with every GB2 profile I have tried.
confirmed same issue tony , the log has NOTHING in it to show why this is happening, its just not doing it.