I'm seeing this error below this evening, from my live help window looks like the same customer on cart.aspx -- not sure if they are trying to check out or what they are doing, but the Event Log shows this error:


Unable to validate data.[ at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) ]



Anyone have a clue?



Thanks