It's always a shame to loose faith in your hosting provider but, after four months of trouble with this site I've left streamline.net for a different company, and one that specialises in ASP.Net hosting.
The problem seemed to center around using the .Net Framework on a sub domain, as there we...
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When adding a site to IIS 7 (simple html page in a location outside of inetpub) I got the following error:
Server Error
HTTP Error 500.19 - Internal Server Error
Description: The requested page cannot be accessed because the related configuration data for the page is invalid.
Error Code:...
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To ensure that .Net validators (asp:RequiredFieldValidator or asp:RegularExpressionValidator) do not output "color: red" in their html you can disable this by adding ForeColor="" to the validator (though it is recommended this is added to all validators using an App_Theme).