SharePoint 2010 - Adding user to a group throws error in IE 9   System.InvalidOperationException: Namespace prefix 'xsd' is not defined.     at System.Xml.Serialization.XmlSerializationReader.ToXmlQualifiedName(String value, Boolean decodeName)      at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderDictionaryEntryArray.Read1_Object(Boolean isNullable, Boolean checkType)      at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderDictionaryEntryArray.Read2_DictionaryEntry(Boolean checkType)      at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderDictionaryEntryArray.Read3_ArrayOfDictionaryEntry()   Happens when you force your page to render in IE 9 and higher.   There is a detailed discussion here :   http://social.msdn.microsoft.com/Forums/en-US/90b3835c-6754-4bb6-9fd4-b74f16f236ff/sharepoint-2010-and-ie9-compatibility?forum=sharepointgeneralprevious  
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