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I have been having the same problem with WP 4.4 and now it’s time for WP 4.5. Is it time to declare this plugin dead?

It does still work though, it’s just a bit messy.

It is a shame but it does appear to have been abandoned.

This really is something that should be in the WP core functionality though!

To fix this, edit the class.post-navigator.php file and change line 184:

from

$( '#post-navigator-buttons *' ).appendTo( $( 'h2' ) );

to

$( '#post-navigator-buttons *' ).appendTo( $( 'h1' ) );

Thanks. Works great now!