Jive for SharePoint uses the following file types: XSL, XML, HTM, and CSS. Files of these types are cached by client browsers unless browser caching is disabled (see Farm Configuration for Jive).
Browser caching generally improves performance because the client need not submit a request or download files which do not frequently change. However, it can be a nuisance when you're changing files on the SharePoint file system such as CSS, XSL, or XML files. In this case it will be necessary to clear the browser cache and issue a full refresh (CTRL-F5).
Steps required to successfully clear the browser cache sufficient to force download of these files varies by browser and version.