A side effect of this feature is that if you for example have activated the Amazon One-click feature all the book entry pages you have visited will not be cached, or listed in the global history. This feature will not work if the password is entered into a Non-HTML form such as forms set up by a Java applet or a plugin. Please note that the cookies are not deleted, except as issued by the server. More and more sites are becoming hyper retentive about browser caching. Set the path where the new cache directory is located.
Opera can check that date to see if there is a newer version.
If the version is newer on the server, Opera will redownload the file. The downside, is that you will have to press your reload button to get a fresh copy of the page.