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I cleaned out my cookies
I'm guessing that there is some ASP code that only drops a cookie if there isn't one which is why you haven't run into the problem until the server tried to drop a cookie.
As aspdaddy says - a Reponse.Buffer = True declaration at the top of you page should resolve your problem otherwise check the code that is dropping cookies (etc) and make sure it happens before any HTML or Response.Write methods.