[kovidgoyal]

Hmm another regression was preventing match_regexps from working. Fixed in svn. Note that in your case match regexps should be

match_regexps = ['http://online.barrons.com/.*?html\?mod=.*?|file://.*']

As for the cleanup hanging it seems to be following a long redirect chain

Use the following code to see the HTTP responses being sent by the server

def cleanup(self):
            try:
                self.browser.set_debug_responses(True)
                import sys, logging
                logger = logging.getLogger("mechanize")
                logger.addHandler(logging.StreamHandler(sys.stdout))
                logger.setLevel(logging.INFO)

                res = self.browser.open('http://online.barrons.com/logout')
            except:
                import traceback
                traceback.print_exc()

You may find the documentation at http://wwwsearch.sourceforge.net/mechanize/ useful for understanding how the browser object works.