MT 3.2: I recently noticed that valid trackbacks to my posts (sent from users using WordPress) are never recived, while I am still getting spam trackbacks in my junk folder.

I did a little testing with sending from http://www.aylwardfamily.com/content/tbping.asp :

• Sending it to the URL <a href="http://www.stamyair.com/cgi-bin/mt/mt-tb.cgi/326" target="_blank">http://www.stamyair.com/cgi-bin/mt/mt-tb.cgi/326</a> works ok (gives error code 0, but trackback is received). This is strange since the trackbacks from the WordPress users are never recived (and this url is the default url).
• Sending it using the format <a href="http://www.stamyair.com/cgi-bin/mt/mt-tb.cgi?tb_id=326" target="_blank">http://www.stamyair.com/cgi-bin/mt/mt-tb.cgi?tb_id=326</a> (as suggested inhttp://www.sixapart.com/movabletype/kb/trackbacks/404_on_trackbac.html ) gives me an error of "no id", while a post with that id does exsists.

The server is a Redhat server, if that matters.

Any idea what is going on here, and how to get "real" inbone trackbacks and not just the spam ones (which never stopped)?

Thanks!

Edit:
Searching the net, it seems that other people have seen the same problem: Trackbacks sent from WordPress blogs do not appear in MT blogs:
http://wordpress.org/support/topic/56182?replies=9
So, is this a known bug?

Edit 2:
I did some more testing using the WordPress test trackback blog:
tamba2.org.uk/wordpress/TestTrack/

It seems that trackbacks sent manually work ok, but automatic ones don't get send.
My templates have the RDF trackback block, so I'm not sure why WP doesn't use it.
My template uses the line

Which produces this code in the post's page:

Has this been fixed? I tried it out on the test weblog and was able to ping both MT 3.2 and 3.31 targets.

Not as far as I can tell- regular pings do work fine, but not from WP users.