I'm getting a 'bad request' error when I try and remove or moderate comments on my home page. I tried adding a couple of lines to my .htaccess file as described in the last post in this thread:

http://www.silverstripe.org/archive/show/1646

RewriteCond %{REQUEST_URI} site$
RewriteRule (.*) $1/ [L]

Which fixes the problem the first time you select "this comment is spam" or "remove this comment", but the second time the bad request error is back. Reloading the page resets it, but this is not ideal.