Could I ask you both to ask your web hosting provider to check the time on their web server? This problem can occur if the time on the web server is set to be significantly earlier than the time in the web browser. Internet Explorer (in it's usual way) ignores this error and sets the cart cookie anyway, despite the fact that it's expiry time has already passed. Firefox, however, plays it more to the letter and deletes the cookie as soon as it is created.
This is the reply from my ISP:
the clock on the server is actually spot on and it is linked to a time server.
I wouldn't bother. We only introduced the P3P policy because everyone thought Microsoft were going to make it a standard for internet explorer to look for this privacy file. As it turned out, they never did.
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