I changed themes and upgraded to WP 3.3.1 yesterday. Now I get a Error 404-Not Found when ever I try to save a draft post.
I switch back to my old them that was working and I get the same error.
I deactivated all my plug-ins and I get the same error.
I tried both Fire Fox and IE.
I checked my permissions 755 for folders 644 for files.
I've seen similar posts about this problem here, but nothing recent and I didn't see that they were resolved.