WP 4.5 Update: Main Sidebar has repositioned itself

This is a known issue and is currently being addressed in Trac under ticket 36510. You can watch the ticket from the bottom of that page if you want to be informed of updates.

So Geoffrey should we 2011 theme users attempt to delete the existing code in functions.php at lines 700-701 and add the code suggested in ticket 36510 – or wait to see if a new 2011 theme update will be issued today?

Thanks

A workaround has now been created for this.

I would recommend using a child theme and adding the following code to its functions.php file:

function wp36510_remove_singular_class( $classes ) {
	$index = array_search( 'singular', $classes );
	if ( false !== $index ) {
		unset( $classes[ $index ] );
	}

	return $classes;
}
add_filter( 'body_class', 'wp36510_remove_singular_class' );