Thanks Ray, even more so for replying on a weekend.
There is another issue that SA 2.04 seems to create. Before SA is installed the client side Show Validation errors works. As soon as SA 2.04 is installed it breaks with the attached error.
Its not a show stopper for me as I don't tend to use Client Side Validation, but I guess you never now when it might come in useful.
Edit : Sorry, I know this isn't strictly a Security Assist problem but I've posted it here as it appears to be the security assist installation that broke it. Cheers