Problema con URLs Amigables con Mod Rewrite

Options +FollowSymlinks
RewriteEngine on

#Errorpages
ErrorDocument 400 http://www.digireflex.net/400_forum.php
ErrorDocument 401 http://www.digireflex.net/401_forum.php
ErrorDocument 403 http://www.digireflex.net/403_forum.php
ErrorDocument 404 http://www.digireflex.net/404_forum.php
ErrorDocument 500 http://www.digireflex.net/500_forum.php

## Server
RewriteCond %{HTTP_HOST} ^digireflex.com.ar$ [OR]
RewriteCond %{HTTP_HOST} ^www.digireflex.com.ar$
RewriteRule ^/?(.*)$ http://digireflex.net/$1 [R=302,L]

# If you are having problems or are using VirtualDocumentRoot, uncomment this line and set it to your vBulletin directory.
# RewriteBase /forum/

RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d

RewriteRule ^.*$ - [NC,L]

# Forum
RewriteRule ^threads/.* showthread.php [QSA]
RewriteRule ^forums/.* forumdisplay.php [QSA]
RewriteRule ^members/.* member.php [QSA]
RewriteRule ^blogs/.* blog.php [QSA]
ReWriteRule ^entries/.* entry.php [QSA]

RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d

RewriteRule ^.*$ - [NC,L]

# MVC
RewriteRule ^(?:(.*?)(?:/|$))(.*|$)$ $1.php?r=$2 [QSA]