I didn't squash any bugs, just some grapes.
{EDIT: Please see MA2 Announcement Thread!}
Microsoft routinely e-mails code to Prolific/SereneScreen that does not work and/or bombs their computers. I think Prolific has filed about 200 bug reports in DirectX and very few have been addressed in DX9.
If any software from Microsoft screams to be open-source or shared-source, it is DirectX. They have their $100 billion. Why do they need to keep DirectX a secret, something that they do not get significant revenue from?