Trackbacks Not Working

Hi.

I was using the trackback feature for quite a while and then suddenly it stopped working. Now, every blog I trackback to does not show my trackback, although when I manage the post from admin it shows that the trackback was sent.

However, when I link to an older post of my own in a new post it sends a trackback to that old post.

I can’t think of any changes that I made to my options or template that would have caused this. Anyone have suggestions for troubleshooting this problem?

Thank you!