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From: Richard Stallman <rms@gnu.org>
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Subject: Re: not too happy with Emacs 21 vertical-line dragging when scroll
	bars present
Date: Thu, 30 Sep 2004 11:59:38 -0400
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    Here's the backtrace (although it's not very helpful):
    Debugger entered--Lisp error: (error "Attempt to drag leftmost scrollbar")
      signal(error ("Attempt to drag leftmost scrollbar"))
      error("Attempt to drag leftmost scrollbar")
      mouse-drag-vertical-line((down-mouse-1 (#<window 3 on *Help*>
    vertical-line (300 . 344) 7448410 nil 342 (0 . 8) nil (0 . 215) (1 . 16))))
      call-interactively(mouse-drag-vertical-line)

What happens if you install an interpreted version of
mouse-drag-vertical-line in that session?  Does the bug still happen?
If so, you can get some real info from the backtrace when
it is running interpreted.