Are Windows-Emacs' scrollbars broken?

[Jon]

I'm running Emacs 21.1.1 under Windows NT.  The scrollbar behaviour is
horrible.

It doesn't scroll all the way to the bottom, stopping a couple of
lines before the end of the buffer.
And the scrolling text jitters up & down while scrolling.

I found a message about this way back in 2001, with no replies.  Have
there been any further advances on it?

Jon