I've added QC to 3 local websites, changed links to pretty permalinks and the plugin works fine.
Added it to this live site and again it works fine...
You can see the caching text at the bottom of each page.
Added it to this live site (genesis theme site) and no caching text at the bottom of any pages / posts...
Both live sites are on the same server and have similar plugins and .htaccess files.
The /wp-content/advanced-cache.php has been created and the cache file is full of files.
Any suggestions would be greatly appreciated.