I get the following error in ie7 but not in firefox when I enter text into an editable region on a page through the cmsdesk:

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

THis error occurs when I enter etxt into the editable region (which is contained in an aspx template) and press the save button.

Has anyone experienced this or know a fix?