I tried the WP Security Scan plugin, which checks the blog for common security problems, such as incorrect file permissions, but unfortunately it causes posting via XMLRPC to fail, so I had to deactivate it. I also tried out some other themes but didn’t really like them, so I went back to the old one.
Try the new version http://wordpress.org/extend/plugins/wp-security-s…
If it still doesn't work please let me know.