Taxonomy Field MultiValue Update Workaround
http://social.technet.microsoft.com/Forums/en-US/sharepoint2010programming/thread/152f1f10-38a5-4a65-9ca6-cac203577747
SPField field = list.Fields.GetFieldByInternalName(“TaxKeyword”);
SPContext renderContext = SPContext.GetContext(HttpContext.Current, item.ID, list.ID,
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