I've been running my blog for over a year, I'm using the latest version of WP, and I've never before had problems posting entries. However, just recently, when I try to post new entries, I get the error message "Forbidden
You don't have permission to access /blog/wp-admin/post.php on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request." I have no idea what is causing this: as I said, it has come on very suddenly and for no apparent reason (I've made no major changes to my blog installation other than installing the latest Spam Karma plugin two weeks ago, which appeared to go smoothly). I tried tweaking with the file permissions on the /blog directory, and on /wp admin and post.php but this doesn't solve the issue.
Can anybody help?