Flickr posting has been working for me fine for several months now, but today I realized my flickr posts were not showing up in the blog.
As I look more in to it, I see that when I try to load xmlrpc.php with a browser, I see the "412 Precondition Failed. The precondition on the request for the URL /blog/xmlrpc.php evaluated to false." message.
At first I was using WP 2.0, and thought maybe upgrading would fix the problem. So I upgraded to 2.2, and the error is still there.
I'm wondering if my host messed up something with the PHP setting or something, because it's been working without issue for so long, and I haven't changed anything.