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Document Preview and Thumbnail issue post SharePoint 2010 December CU 2011installation

After updating one of my SharePoint 2010 labs with SharePoint 2010 December 2011 CU, I noticed that I could not see the document preview and thumbnails as part of my search results. After some digging with Fiddler I noticed that the call to wacproxy.ashx was returning a weired error as follows:

(‘ERROR:600:required parameters either missing or invalid’)

This issue should be resolved in next CU, but for now if you are using Fast and Office Web Apps and you need to have the document preview and thumbnail in your search results, DO NOT INSTALL December 2011 CU.