Strange behavior since the update. I don't have cookies issues elsewhere, but WPW cookies are no longer persistent even though I check the "keep me logged in" option.
If I attempt to post and I'm not signed in, I am not redirected to any login screen. The current page simply refreshes. If I then sign in from that particular page, (not the log out/in page) the page simply refreshes with no "you are now logged in message", but now I can in fact post.
No big deal, but maybe others are having a similar issue.