Apache reverse proxy to IIS6 having dynamic url problem?

i have set up apache here

But for some reason a couple of URLs gives me a white page

Is this a cache thing?? if so can i flush the cache? and How?

I set up my virual host like so, help please

<VirtualHost *:80>
  ServerName iwitness.x24hr.com
  Options FollowSymLinks Indexes
  DirectoryIndex index.html index.htm index.php
  DocumentRoot "C:/Program Files/Apache Software Foundation/Apache2.2/htdocs/kangaroocourt"
  ProxyRequests Off
  <Proxy *>
    Order deny,allow
    Allow from all
  </Proxy>
  proxyPass / http://localhost/kangaroocourt/
  # proxyPassreverse / http://localhost/kangaroocourt/
  <Location />
    ProxyPassReverse /
  </Location>
</VirtualHost>

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