I upgraded to 2.0 a week ago. Right away I had a problem: I would submit a post to publish, and it would... go away. Disappear. Poof! It wasn't published, it wasn't in my "saved posts", nowhere. I've started cutting-and-pasting the contents and trying multiple times. Sometimes they do get posted (and I get the "Post published" color bar across the top of the admin panel).
However, now some of my readers are saying they see multiple copies of my posts! I don't (XP + Firefox), and I don't see multiple copies in my database either.
Does anyone else have this porblem, or any ideas?