This is now become a known issue in SharePoint Foundation 2013 SP1 that it can affect the functionality of the Search WebPart. So, do not instal it on production environemnts until a fix is available.
Important: A known issue in SharePoint Foundation 2013 SP1 can affect the functionality of the Search WebPart. We encourage you to limit production installations of SharePoint Foundation 2013 SP1 until a fix is available. SharePoint Server 2013 is not affected by this issue.
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