After upgraded for WP 2.7 pingback/trackback stopped working in my site! I tried everything: already "asked" to Google, friends, searched here and there… but the only thing I found was: http://www.petertan.com/blog/2008/12/16/downgraded-from-wordpress-27-to-265/ This guy had the same problem, but he made a downgrade. I don't wanna it!
Well, "stopped" isn't quite right. I explain: my site can't send trackbacks or pingbacks, but can receive some trackbacks (from others sites, of course).
Other thing weird, when you write an URL in the post the system automatically send the trackback if the other site is built-in with WP, right? And "Trackback Tab" above the post (in admin area) show the information… well, for me, no more!
So, anybody has a clue or something? :/