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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