A problem i noticed. It seems AS7 can't maintain http session for IE. I wrote a very simple jsp to display the session create time:
Date createtime = new Date( request.getSession().getCreationTime());
DateFormat df = DateFormat.getDateTimeInstance();
On AS6, the page on IE will render the same time stamp (meaning AS6 can maintain session). But on AS7, IE will render different time stamp everytime i refresh the page (refresh interval is 10 sec).
PS. I don't see any problem when use Google Chrome. I am using IE9 (cookies enabled).