Yup, the guest should be the default user. In portal-data-sample.vm I have:
insert into User_ (userId, companyId, createDate, modifiedDate, defaultUser, contactId, password_, passwordEncrypted, passwordReset, screenName, emailAddress, greeting, loginDate, failedLoginAttempts, agreedToTermsOfUse, active_) values ($defaultUserId, $companyId, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, TRUE, $defaultContactId, 'password', FALSE, FALSE, '$defaultUserId', 'default@liferay.com', 'Welcome!', CURRENT_TIMESTAMP, 0, TRUE, TRUE);
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