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I was misled by the NB mercurial file history UI. When you do a mercurial diff on a given file the yellow arrow GotoNext/Prev difference buttons will automatically go to the next changeset which is very unexpected. There's no indication that you're viewing a new changeset except for a way-too- subtle change in the revision #'s at the top of the diff view. This had an unintended _social_ consequence in that I started "blame"ing someone for a change they weren't responsible for :-)
This works as designed. Navigational buttons move to the next/previous changeset when you are at the end/beginning of the current changeset. We'll try to find a better and more significant notification that current changeset has changed.