SharePoint 2013 Remote Blob Storage Stops Working after December 2014 Cumulative Update

I upgraded a test environment over the weekend that had the SQL Server 2012 Remote Blob Storage provider configured and working. After the upgrade I got errors accessing Remote Blob Storage files, with a “Permission Denied” SQL error appearing in the ULS logs.

The Web Application account in use by SharePoint was a member of the DBO role to enable Remote Blob Storage to work properly. After the Cumulative Update was applied, this permission was gone. I added the permission back via SQL Management Studio, and Remote Blob Storage worked again. CU quirk perhaps?

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