having a huge problem with a site. i updated the theme to use post thumbnails (that's how old it is) and then when trying to upload an image to use as featured thumbnail: the images process/crunch but then the URLs result in 404s.
there isn't anything abnormal in the site's .htaccess. there actually wasn't a wp-content/uploads directory so i made one and the chmod permissions are 0755, so that shouldn't be the issue. i reset the media settings folder to be the default but no images are ending up in that folder.
edit: changing the uploads folder to 0777 permissions seems to resolve this. is it safe to leave the permissions this way?