Trackback Link is Suddenly Missing

I’m very new to WordPress, but as compared to any kind of content management I’ve used before it stands head and shoulder above them all.

Am I missing something here? I had trackback links yesterday, but today they’ve all gone missing. I checked every page in the dashboard and pings are allowed in the post page, but the link for the trackback doesn’t show up on the front side.

Since my blog co-operates with a lot of other blogs, those are particularly useful. Are there any places in the Dashboard or the code I should check? Or am I out of my tree here?

Thanks!
Bill