If you are binding the control to a RSS feed, then the rotator data is being retrieved on the server. The browser receives only the result so if the RSS feed is cached, it is not by the browser but by the web server. See our online example, which uses a XmlDataSource to retrieve the RSS from a Sitefinity site. If you have a different solution, try implementing it as shown in the example. If you are already using XmlDataSource, try rebinding the rotator using server code - manually retrieve the RSS using a WebRequest object and force no cache in the request headers.
All the best,
the Telerik team
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