title: How to debug through .NET Framework source code?
body: <p>I've followed the steps outlined in <a href="http://blogs.msdn.com/sburke/archive/2008/01/16/configuring-visual-studio-to-debug-net-framework-source-code.aspx" rel="noreferrer">http://blogs.msdn.com/sburke/archive/2008/01/16/configuring-visual-studio-to-debug-net-framework-source-code.aspx</a> to enable source debugging of the .NET Framework, and I had it working in the past.  Now that I'm using .NET 3.5 SP1, it seems to have stopped working.  Beyond the steps in the blog entry I just mentioned, what special steps can I make to get source debugging working again?</p>