SharePoint 2010 Search – december CU warning

If you are currently running a pre December 2011 CU farm and have set up custom search center be careful before installing it. It seems like the maximum number of filters per refiner limits have been set to 250. We were previously using a value of 255 for a refiner. Thus installing the CU (SPF, SPF) broke our search center page with the following error:

Internal server error exception: System.ArgumentException: Max number of filters has to be between 0 and 250     at Microsoft.Office.Server.Search.WebControls.FilterCategory.set_MaxNumberOfFilters(Int32 value)

After discovering the issue we changed to value to 0 (display all the filters according to MSDN http://msdn.microsoft.com/en-us/library/ff625183.aspx, thank you Wesley for the suggestion by the way :) )

<WpNs0:UbiRefineMentWebPart FilterCategoriesDefinition

    MaxNumberOfFilters=&quot;255&quot;

to

<WpNs0:UbiRefineMentWebPart FilterCategoriesDefinition

    MaxNumberOfFilters=&quot;0&quot;

And problem solved.

More complete log below for searching purpose :

03/20/2012 16:16:07.85 w3wp.exe (0x1578)       0x1724  SharePoint Server Search           Query   dn1p                Medium              Filter category FASTMaxNumberOfFilters in the config is in wrong format.Input string was not in a correct format.

03/20/2012 16:16:07.85 w3wp.exe (0x1578)       0x1724  SharePoint Server Search           Query   g1j9                Exception           Internal server error exception: System.ArgumentException: Max number of filters has to be between 0 and 250     at Microsoft.Office.Server.Search.WebControls.FilterCategory.set_MaxNumberOfFilters(Int32 value)     at Microsoft.Office.Server.Search.WebControls.RefinementManager.ConfigureCategories()     at Microsoft.Office.Server.Search.WebControls.RefinementManager.Initialize(Location location)     at Microsoft.Office.Server.Search.WebControls.CoreResultsDatasourceView.CreateLocationList()     at Microsoft.Office.Server.Search.WebControls.CoreResultsDatasourceView.SetPropertiesOnQdra()     at Microsoft.Office.Server.Search.WebControls.SearchResultsBaseWebPart.EnsureWebpartReady() System.ArgumentException: Max number of filters has to be between 0 and 250     at Microsoft.Office.Server.Search.WebControls.FilterCategory.set_MaxNumberOfFilters(Int32 value)     at Microsoft.Office.Server.Search.WebControls.RefinementManager.ConfigureCategories()     at Microsoft.Office.Server.Search.WebControls.RefinementManager.Initialize(Location location)     at Microsoft.Office.Server.Search.WebControls.CoreResultsDatasourceView.CreateLocationList()     at Microsoft.Office.Server.Search.WebControls.CoreResultsDatasourceView.SetPropertiesOnQdra()     at Microsoft.Office.Server.Search.WebControls.SearchResultsBaseWebPart.EnsureWebpartReady()