I'm having some issues trying to make my Wordpress installation "bullet proof". I was installing Wordpress on my testing server, when I noticed that I had a permission problem with folders and themes installation. I tried to fix it using the following commands, located in this SF answer:
For Directories:
find [your path here] -type d -exec chmod 755 {} \;
For Files:
find [your path here] -type f -exec chmod 644 {} \;
You have to omit to use this command for /wp-includes/.
Now I just see a blank screen in my Wordpress directory. I don't want to chmod 777 the Wordpress directory. That would fix the problem, but would create a security issue.