I have a nightmare scenario where -- just getting ready to launch a site -- permalinks are suddenly not working and it breaks CSS and can't find PHP templates. I have the permalink structure set to "http://domain.org/%postname%-by-%author%/" but when I click on a post the permalink only calls postname, for example: http://domain.org/%postname%
My host provider checked the htaccess file and can't find any problem. I can't see one either. I have searched around and see many Wordpress users having permalink problems but they all seem to have different solutions. I am at a loss. Any help would be greatly appreciated.