I've created a TreeTableView using a folder/file structure, I start all of the tree nodes to be expanded. The vertical scrollbar does respond at that point as expected by scrolling the treatable content. However, if I collapse one of the parent nodes the vertical scrollbar does not scroll the content consistently. Sometimes it works and sometimes the content does not scroll at all, when I re-expand the node it still does not reset the vertical scrollbar.
I'm using Java(TM) SE Runtime Environment (build 1.8.0-ea-b114) on Mac OSx Mavericks.