Permalink Bug

Hi, Thanks for creating this great plugin. It helps me a lot in managing our email campaigns. I’ve just noticed a weird bug with permalink, that breaks our permalink structure (returns 404 for archive & single custom post type pages). After digging into the code of the plugin, I see that you use flush_rewrite_rules() right after register_post_type() function. That causes a lot of unneeded calls to refresh permalinks on every page load, which might affect other permalink setup. Regarding the Codex , this function ( flush_rewrite_rules() ) should be called only once when the plugin is activated. I suggest removing that line ( class-chimppress-setup.php file, line 72) to make it work properly (after removing this line, our permalink structure works pretty well). Thanks. http://wordpress.org/plugins/chimppress/