A bug in Google Toolbar has resulted in the search giant receiving information about users' Web surfing in violation of the product's privacy policy, according to an anti-spyware and privacy researcher. In a report to be released Tuesday, Ben Edelman, an assistant professor at Harvard Business School, shows that under certain circumstances the Google Toolbar (versions 6.3 and above) tracks the browser habits of Internet Explorer 8 users who have activated the toolbar's "enhanced features" even when the toolbar is turned off or disabled.