I had this problem too. I did some debugging and found the cause. The page I tried to link is set to be ‘private’ and the plugin only accepts post_status to be ‘static’ or ‘publish’. It would be interesting to hear if this is a bug or a feature. I can’t figure out the reason to disallow private pages from opening in a new window, maybe I’m missing something obvious here?
I´m using the 2.3 version of the plugin and AIO SEO, but I can not get it to open in a new window.
I´ve checked the entries in the database and all seems fine, double checked the “9” above. Tried to switch off AIO plugin, still no luck.
When looking at the code in page-links-to.php I saw some strange blankspaces in the bottom and the closing php-tag was missing. Is it supposed to be like that or is it a zip/download problem?