Herein lies the problem, it works Ace in Firefox but not in IE6 or IE 7 and Opera is the same. I used the downloaded sourcecode in C# and have been firefighting this issue since--

Any help appreciated

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.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.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.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[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.]
   System.Web.UI.ClientScriptManager.ValidateEvent(St ring uniqueId, String argument) +2082569
   System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +106
   System.Web.UI.WebControls.TextBox.LoadPostData(Str ing postDataKey, NameValueCollection postCollection) +31
   System.Web.UI.WebControls.TextBox.System.Web.UI.IP ostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +11
   System.Web.UI.Page.ProcessPostData(NameValueCollec tion postData, Boolean fBeforeLoad) +408
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint



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Did you google EnableEventValidation and ClientScriptManager? Are you writing your own server controls? This error is obviously tied to the TextBox. The client side jscript seems to have been tampered with? Are you using partial page postbacks?

This

The only thing I have changed with this page is the Page Name !!
I have not actually added or removed anything from the TBH Starter kit that affects this at all.

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404 real life user not found

The control id's are changing so the postback is trying to call events with the wrong id's. I haven't been able to figure out what's going on here, but maybe you have an old copy of a temporary assembly. You can try executing iisreset and then rebuild all in VS to see if this fixes it.

This web.config change should fix you in every case, but this is a setting that weakens security so it's not the best possible answer. Add this to the <system.web> section of your web.config file:

<pages enableEventValidation="false" />

Cheers Sorted many thanks

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