.htaccess, permalinks and advanced editor issues

Hi,

I am having trouble with both permalinks and viewing the advanced editor… and I am wondering whether these issues are related.

First the permalinks problem:

I can edit the URL on a page, but it does not go into effect. When I change the URL and click save, the URL reverts back to the previous address.

My .htaccess file has a 0666 permission setting.

Here it is:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

The second issue is that I cannot switch to the advanced editor.

Is this related to a CHMOD permissions setting?

Thanks,
Josh