I got an email from a user who was posting to a relatively simple list and getting an error every time. He had a Correlation ID for me and when I looked it up I got the message below. After
talking with him, I realized he was using Chrome.When he tried from IE, everything worked fine.I didn’t see this error message connected with Chrome anywhere, so I thought I’d share in hopes that it could save someone else some time.
04/11/2012 09:03:45.83 w3wp.exe (0x13AC) 0x1B80SharePoint FoundationRuntimetkauUnexpectedSystem.ArgumentException: Invalid postback or callback argument.Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.at System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument)at System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey, NameValueCollection postCollection)at System.Web.UI.Page.ProcessPostData(NameValueCollection pos...e316583f-7d5c-4466-bced-6cb3cfea2137
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