The 2.6 update to ThreadFix introduced caching to the Analytics and Dashboard pages to improve their performance. The configuration for caching is handled in two separate XML configuration files, applicationContext.xml and ehcache.xml...
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Additionally, the ehcache.xml file (path: <threadfix-deploy>/WEB-INF/classes/ehcache.xml) can be configured according to the EhCache documentation located here: http://www.ehcache.org/documentation/3.0/xml.html.
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To:<ttl unit="minutes">10</ttl>
Note: If you want to keep caching enabled but need to reset the cached report data on an on-demand basis (before the scheduled TTL expiration), you can restart Tomcat.