Hi Trevor,

Many thanks for the quick response – I’m using the Quark Theme and have been for the last two years without any trouble with pagination (in fact it was working perfectly until recently) – the only thing I can think of that has changed is updating WP to 4.2.2 (from 4.3.1) and updating the S&FP plugin to 2.1.2 (from 2.1). The Theme itself has not been updated in ages.

BUT that said, here is the code from Quark’s functions.php that constructs the navigation – it pretty much uses the standard WP pagination but replaces the ‘next’ and ‘previous’ with page numbers.

Hopefully this is helpful in finding the source of the trouble 🙂

 /**
 * Displays navigation to next/previous pages when applicable.
 *
 * @since Quark 1.0
 *
 * @param string html ID
 * @return void
 */
if ( ! function_exists( 'quark_content_nav' ) ) {
	function quark_content_nav( $nav_id ) {
		global $wp_query;
		$big = 999999999; // need an unlikely integer

		$nav_class = 'site-navigation paging-navigation';
		if ( is_single() ) {
			$nav_class = 'site-navigation post-navigation nav-single';
		}
		?>
		<nav role="navigation" id="<?php echo $nav_id; ?>" class="<?php echo $nav_class; ?>">
			<h3 class="assistive-text"><?php esc_html_e( 'Post navigation', 'quark' ); ?></h3>

			<?php if ( is_single() ) { // navigation links for single posts ?>

				<?php previous_post_link( '<div class="nav-previous">%link</div>', '<span class="meta-nav">' . _x( '<i class="fa fa-angle-left"></i>', 'Previous post link', 'quark' ) . '</span> %title' ); ?>
				<?php next_post_link( '<div class="nav-next">%link</div>', '%title <span class="meta-nav">' . _x( '<i class="fa fa-angle-right"></i>', 'Next post link', 'quark' ) . '</span>' ); ?>

			<?php } 
			elseif ( $wp_query->max_num_pages > 1 && ( is_home() || is_archive() || is_search() ) ) { // navigation links for home, archive, and search pages ?>

				<?php echo paginate_links( array(
					'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
					'format' => '?paged=%#%',
					'current' => max( 1, get_query_var( 'paged' ) ),
					'total' => $wp_query->max_num_pages,
					'type' => 'list',
					'prev_text' => wp_kses( __( '<i class="fa fa-angle-left"></i> Previous', 'quark' ), array( 'i' => array( 
						'class' => array() ) ) ),
					'next_text' => wp_kses( __( 'Next <i class="fa fa-angle-right"></i>', 'quark' ), array( 'i' => array( 
						'class' => array() ) ) )
				) ); ?>

			<?php } ?>

		</nav><!-- #<?php echo $nav_id; ?> -->
		<?php
	}
}