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I finally did a system restore and that solved the problem. Did I have a gremlin in the system or what possible explanations could ther be for this instance? Very strange indeed as no new anti-anything software was installed.
Opera and FF handle cookies separately from IE, which uses the settings in the Internet Properties (found via Control Panel or IE [Tools¦Internet Options...]) Those cookie settings should not affect other browsers.
My guess would be a WebmasterWorld glitch, but if it was happening everywhere then you may have something in your system. If you don't have any malware scanning tools installed I suggest you get some.