Fancy URL returns 404 error

[Curistofa]

Hi, I'm running a site on GetSimple 3.2.3

I'm trying to change my permalink structure to '%parent%/%slug%/', but when I do, each page just takes me to a 404 error page. I have mod_rewrite enabled, and am using the latest apache. I'm assuming it's something wrong in my htacess, but I have no idea as to what it is.

Here's my htaccess if it helps

Code:

AddDefaultCharset UTF-8
Options -Indexes

# blocks direct access to the XML files - they hold all the data!
<Files ~ "\.xml$">
    Order allow,deny
    Deny from all
    Satisfy All
</Files>
<Files sitemap.xml>
    Order allow,deny
    Allow from all
    Satisfy All
</Files>

RewriteEngine on

# Usually RewriteBase is just '/', but
# replace it with your subdirectory path -- IMPORTANT -> if your site is located in subfolder you need to change this to reflect (eg: /subfolder/)
RewriteBase /

RewriteRule ^blog/post/([^/.]+)/?$ index.php?id=blog&post=$1 [L]
RewriteRule ^blog/tag/([^/.]+)/?$ index.php?id=blog&tag=$1 [L]
RewriteRule ^blog/page/([^/.]+)/?$ index.php?id=blog&page=$1 [L]
RewriteRule ^blog/archive/([^/.]+)/?$ index.php?id=blog&archive=$1 [L]
RewriteRule ^blog/category/([^/.]+)/?$ index.php?id=blog&category=$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule /?([A-Za-z0-9_-]+)/?$ index.php?id=$1 [QSA,L]

Here's my site, if it helps

Oh and I have looked through a lot of earlier posts about this issue, but I havent had any luck