Nobody can help me, please?
I notice that a blog pings my and other blogs: these one have the pingback, my blog not.
But if everything works with Internet Explorer, it’s impossible I missed something. Anyway, I re-uploaded wp-includes. The problem persists.
I have the same problem: it is not a cache problem. I trued on different computers. The result is the same. No problem with IE 6 and IE7. The problem is with Firefox (Linux and Windows) and Opera (Linux).