apclarke

This is how I fixed the problem – a bit involved, but it has worked for me and has eradicated the multiplication of imported posts.

Look for this code in lib/class_wdgpo_google_auth.php (around line 300):

private function _is_imported ($gplus_id) {
		$posts = get_posts('meta_key=wdgpo_gplus_item_id&meta_value=' . $gplus_id);
		return $posts ? true : false;
	}

Change it to this instead:

private function _is_imported ($gplus_id) {
	$posts = get_posts(
		array(
			'meta_key'    => 'wdgpo_gplus_item_id',
			'meta_value'  => $gplus_id
		)
	);
	if ( count($posts) > 0 ) return false;
	else return true;
}

Next you will need to rid the database of duplicate posts. Look in the Posts table first and find any duplicate posts in there. Make a note of the ID of any duplicate posts and then delete them. Then go to the PostMeta table and look for the post_id with the same number(s) you just deleted in the other table. There should be 3 entries in here per post each having the same post_id that you deleted in the other table (wdgpo_gplus_feed_id, wdgo_gplus_item_id and wdgo_glus_author). Delete these as well.

Finally, there is an updated version of this plugin (free) from here https://premium.wpmudev.org/project/google-1/. You will still need to fix the code as described above.