OK up until installing 2.0 (and subsequently 2.0.1) I was having no trouble with trackbacks on my site.
After doing a full install proper upgrade (and one install to a new database) I've found that no trackbacks are working. Rather than be directed normally - I'm getting a page which appears to be coming from the server. It reads: "200 OK The page has moved here" (here being a hot link to the permalink.)
I have used the "trackback_url()" template tag as well as the alternate "trackback_rdf()" in order to check the validity of the url it generates.
It's just not working...
Now I've searched around (and I tried 2.0.1 after reading the notes) but I'm stuck. Did I miss something somewhere?