My client site http://www.saldef.org has a blue menu on the right side of the page (learn about, know your rights etc..)
When you click on them, they open in a new window. Target="blank" is not in the code. That section of the nav is hard coded in the template as below
<ul id="nav_left">
<li><a href="<?php echo get_option('home'); ?>/?page_id=26" class="top_1">Learn About Sikhs</a></li>
<li><a href="<?php echo get_option('home'); ?>/?page_id=27">Know Your Rights</a></li>
<li><a href="<?php echo get_option('home'); ?>/?page_id=6">Report an Incident</a></li>
<li><a href="<?php echo get_option('home'); ?>/?page_id=7">Get Involved</a></li>
<li><a href="<?php echo get_option('home'); ?>/?page_id=39" class="bottom_1">Resource center</a></li>
</ul>
I am running these plugins (all up to date)
Akismet
Berri YouTube Gallery (Widget)
Redirection
WP-Polls
WP-reCAPTCHA
WPaudio
This problem happened in wordpress 2.92 an 3.0. I do now know when it started, but I know the site did not do this a couple of weeks ago.
I am stumped!