I have been using WordPress since March 2007, and this is a new behavior that started a few days ago when I updated to 2.3.1 (using Fantastico). The behavior is that when I post, I get a healthy "Done" in the status bar, but the screen goes blank, and when I try to navigate I get a warning about navigating away from a page that still has data in it. I have been trying to work around it, but it has been leaving behind little surprises, like an extra draft of previous posts. This morning, when I was trying to edit a new post, I accidentally picked a previous bogus draft, and ended up posting the same blog twice. That's when I discovered a second buggy behavior. I tried deleting the duplicate blog. It seemed to cooperate, but the supposedly deleted blog is still there. Here's the permalink to the one that I've already "deleted" twice. http://memorywritersnetwork.com/blog/memoir-interview-with-60s-celebrity-dee-dee-phelps-2/
I'm using a fresh updated copy of Mozilla (because Explorer was misbehaving), and am on Windows XP.
Thanks for any help, workarounds you can offer, but bug fixes will have to wait until fantastico gets around to posting it.