Known issues for version 3.0 Alpha-1
From Joomla! Documentation
At this time, the following are known issues with Joomla! version 3.0 alpha-1.
- Cache is not cleared after changes made in back end. For example, if you unpublish an article with caching enabled, it will still show as published until the cache is manually cleared. The same is true for the other components. See tracker issue 28817.