Hopefully, this will be good news. I believe I may have found the strings that caused so many Trackback pings to fail over the last couple of weeks, and I have removed them from my MT-Blacklist system. If you continue to see problems with the Trackbacks and you’ve confirmed that your ping was sent correctly, send me the excerpt that went with your ping so that I can double-check for more bad strings.
Thank you for your patience!