The latest update will break your site if you are not using PHP3 or newer. There is no warning to check the PHP version prior to install, you just find out after the site is broken.
Fixed by: 1. Deleting Quick Cache plugin via ftp. 2. Updating site to PHP 3.
Just deleting the plugin is not enough to fix the site. Got a fatal error until I updated to PHP 3.
Am not brave enough to try re-installing this plug-in, besides, another reviewer says many of the features are gone. I will be avoiding this one in the future.