Pretty URL 404s

[snooze]

I can never seem to get past this:

Once I set Pretty URLs, all links that have slugs applied are not found by the rewritten link.

I am currently using GS Blog. (This behavior has plagued me with lots of other GS configurations) The blog page is fine, but when I click to go to the entry by its title, I get:

Oops! Page not found!

We are sorry, but the page you are looking for does not exist.

This can be experienced at http://www.salsburg.us.

Any help appreciated. I know it is something I have left out or is misconfiured.

My .htaccess file is pasted below - unchanged from the suggested code provided by GS Blog.

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

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