Blurry fonts when scrolling

Fonts get blurry when scrolling in a diff. I'm not much of a WPF developer, but please see:

http://stackoverflow.com/questions/4206166/visual-studio-2010-text-becoming-blurry-when-scrolling
http://blogs.msdn.com/b/text/archive/2009/08/24/wpf-4-0-text-stack-improvements.aspx