This is caused by a missing set of brackets in an 'IF' statement. This error was introduced in 3.6.0.
To fix it, edit bfa_header_config.php and change lines 344-345 from
HTML Code:
if ( $bfa_ata['overlay_blog_tagline'] == "Yes" ) echo '<p class="tagline">'; bloginfo('description'); echo '</p>';
HTML Code:
if ( $bfa_ata['overlay_blog_tagline'] == "Yes" ) { echo '<p class="tagline">'; bloginfo('description'); echo '</p>'; }
bfa_header_config.php.zip