Odd Change in Upgrade to SharePoint 2013 in Office 365–Filterable Columns in Lists

In our consulting practice, we have a document library for storing our sales presentations, documents, and templates.  In order to make it easier to find older materials, we created a “Sales Document” content type with a number of filterable columns.  The columns use the term store to provide a hierarchical tag structure.

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We originally created the document library in the SharePoint 2010 version of Office 365 and over the weekend we upgraded to SharePoint 2013.  In upgrading, our filter columns broke – in our list view they are no longer filterable!  If you hover over the column, you get the error, “This column type cannot be sorted or filtered”. 

I thought it might be some corruption during the upgrade process, so I created a new Document Library and assigned the exact same content type with the same columns.  The document library worked just fine. 

Then I turned on Metadata Navigation Fields for hierarchy and filter fields and my problem re-occurred. 

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So here seems to be the rule: if you turn on navigation filtering, the filtering within the column header becomes disabled.  This seems to be new to 2013 as I had turned these on in 2010 and it worked just fine.