Scroll bar scrolls too much on a page up page down

From: Sam (anonymous_at_discussions.microsoft.com)
Date: 02/29/04 

Date: Sun, 29 Feb 2004 11:57:07 -0800

If I click on the scroll bar in a window to make it go a
page up or a page down, it scrolls 2 screen lengths.

I don't know why it's doing this, it used to only go 1
screen length, and that's what I would like it to do again.