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.
SharePoint Server 2013 is not effected by this update as mentioned on the SharePoint Foundation 2013 SP1 Download Page.
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.

Adnan is six time Microsoft MVP (Since 2015) with over 16 years of extensive experience with major expertise on SharePoint, SharePoint based development, Microsoft 365, Microsoft Teams, .Net Platform and Microsoft BI. He is currently working Sr Microsoft Consultant at Olive + Goose. He is MCT Regional Lead for Pakistan Chapter since 2012. He is working on SharePoint for past 12 years and worked on different intranet/intranet solutions for private & govt. sector majorly in United states and Gulf region and have experience of working with multiple Fortune 500 companies. He is a trainer, technology evangelist and also speaks in community forums.
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