Error: Attempted to make calls on more than one thread in single threaded mode using multiple Content by Search web parts

In SharePoint 2013 when adding more than one Content by Search web part to a page you may receive the following error
“Attempted to make calls on more than one thread in single threaded mode. (Exception from HRESULT: 0x80010102 (RPC_E_ATTEMPTED_MULTITHREAD)) Correlation ID: 00000000-0000-0000-0000-000000000000“
This is caused by a bug in the original release, this has been fixed in the April Update, which can be downloaded from here http://support.microsoft.com/default.aspx?scid=kb;EN-US;2726992
Please be aware that this is not really a CU as it requires http://support.microsoft.com/kb/2767999 to be installed first.

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