.html Redirect No Longer Working

I had my site setup to use .htaccess to redirect old URLs written as http://www.domain.com/TITLE.html to http://www.domain.com/TITLE/

Since I added W3TC this is no longer working.

This is what I had in my .htaccess-

# Begin 301
RewriteEngine On

RewriteCond %{HTTP_HOST} !^www\.domain\.com [NC]
RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R=301]

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

# END WordPress

http://wordpress.org/plugins/w3-total-cache/