Updating Cache

When I manually add new posts or add through the control panel my installation is no longer updating the cache. My homepage and rss feed no longer will show the new post unless I manually delete the cache folder's content. If I navigate to a taxonomy triggered page, even one that has been visited before, the newly created page shows up only on that page. The cache folder is writable, it has no problems recreating a new cache after I delete it. Any suggestions?

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