Hi Joe,

I'm running mojoPortal (2.3.51 MSSQL) on multisite mode with Userelatedsites set to 'true', and got an exception while logged into the parent site, setting "Features" for a child site. Upon hitting the "Save" button the exception is thrown:

[ArgumentException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration o
r <%@ 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.]

   System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +11179720
   System.Web.UI.WebControls.TextBox.LoadPostData(String postDataKey, NameValueCollection postCollection) +47
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +543
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2637

It's not referencing a particular file. I did some research and found on the msdn library that this exception is called when the EnableEventValidation property was set after the page was initialized. I don't know where to set this property, and also it would probably be overwritten the next time I upgrade anyway so thought I'd include it here and see what advise you have.

Thanks,

Beth

Hi Joe,

I checked my web.config and that line of code was there. I fetched the entire source at the time of your last fix so it should have grabbed everything. 

Best,

Beth