[Plugin: WP-PageNavi] WP-pagenavi noy working with custom permalinks

Hi, as the title says, The plugin doesn’t work when I modify the permalinks.

First it showed me a 404 error page, then I search in other blogs and installed this other plugin “Category pagination fix”, but now it sends me to the home page.

What should I do? i’ve tried many options.

This is my code.

<?php
		$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
		$args = array(
			'post_type' => 'fotos',
			'post_status'=> 'publish',
			'showposts' => '8',
			'paged' => get_query_var('paged')
		);
		$wp_query = new WP_Query( $args );
		while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
<stuff></stuff>
<?php endwhile; ?>
		<?php wp_pagenavi(); ?>

I really hope anyone could help me, Please!

Thanks!

http://wordpress.org/extend/plugins/wp-pagenavi/