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From the official Joomla site: "Joomla! 3.6.3 is now available. This is a bug fix release for the 3.x series of Joomla. This release fixes a Backwards Compatibility Break we made in 3.6.2 with the article ordering. In addition there are a large number of minor improvements and bug fixes."
Some administrators have experienced a problem with managing modules after installing this update. The fix is easy: Clear the site cache from the Admin Center and clear your browsers cache. That will fix the module problem