I am having the same issue. WP 3.1 with the plug-in version 4.9.3. I initally installed with the automated installer and then removed that entierly and uploaded via FTP with no difference. I have tired the deactivate and reactivate trick aswell. On my site when I visit the links page I see No Links found as well as a link for the category and I turned on the link counter so I see the two links I have setup. When I click on the category nothing happens. When I try to search one of the links nothing shows up.
I enabled debug mode but I didn’t see anything different about what appears on the page. I have also noted that aside from the thumbnail of the website other content enter in the Link Library – Additional Peramiters section of the link edit page do not seem to hold what is put in them. I have tried making a link a featured link and putting a large description in but after saving when I go back to edit the content is not there.
http://www.hopechapelverona.org/?page_id=23