One of those links has a video of the problem and frankly, I am confused.
In the video the guy is constantly clicking on folders in the left pane, most of the time the folders just simply unfold to show subfolders, but sometimes, there is no space, so the whole tree moves vertically. A couple of times the tree moved down, so that what one sees in the left pane actually starts from the top of list, so effectively, the folder the guy was clicking on turns out being somewhere in the bottom.
I tried to reproduce the problem by clicking on all kinds of folders in the left pane and I ran out of patience before any jumping has occurred. I don't see any problem.
I have XP on an old laptop and I went out and compared. I saw exactly the same thing: If I click on the + (or triangle in 7) the folder will unfold to show subfolders. If the subfolder list is too long, then the unfolding folder will jump to the top of the pane. I have observed that both in XP and 7.
So, maybe there is a bug in that jumping and sometimes it might jump the wrong way, but I guess I am not clicking on that left pane often enough to see it and get annoyed

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