When I log in from home, I always get this message when clicking on Replies or Private Messages in the toolbar. I also cannot preview

An important section of the HTTP header required by our server to access this option has been
hidden by your browser. This is usually related to users behind proxies where the proxy is 
hidding this information. In order to use this option, you need to make sure your proxy does not 
block this standard information. You may adjust or contact your network administrators

Seems that the http headers are not letting the page get through Zone Alarm.