their password reset form says that there is no account associated with my email, which I find bizarre.
The form that I use does not respond with any indication that the email you entered is truly a valid account or not -- it ALWAYS appears to respond with: "An email has been sent to your email address." (even if a bogus email address is entered).
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http://mtgox.com/login/lost-passwordSo if you are getting different results what method are you using to try to reset the password?