Marina, this sounds either like a caching issue or a skin problem (e.g. applying XHTML now). AJAX might be an issue as well - if you are using a skin or module using it's own JS. What happens on a page with default skin and HTML module applied?

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Cheers from Germany,
Sebastian Leupold

   

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I started from scratch once more, upgraded AJAX and Data Springs Login and Registration. I am able to browse limited sections of the site. When trying to change site settings I get the following error message, System.Web.HttpException: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request. Thoughts? Thanks, Marina