I can't seem to replicate it. That was rather dumb of me. I apologise for wasting your time.

If I have the html

<a href="http://foo.com/">'foo bar'</a> then the link is not picked up, either for trackbacks or by the 'Links in this post' module.

If I modify the link to remove the ' then it works fine e.g.
<a href="http://foo.com/">foo bar</a>

Tis but a small error.

--
Serendipity rocks ...