IE8 accesses our public pages (non-protected) but crashes at login

It is possible to access all the public pages on our site using IE8 but the browser crashes when you click on the 'Log In' button on .com/login/ page. The Title of the Page appears in the browser tab and then the browser crashes. After re-opening the browser, it crashes even if you visit the public pages. You have to clear browser history (cookies and cache) to get back to the public pages. Does that mean it is a cookie problem? We are using Blogs MU theme and BuddyPress is one of our plugins. Link to thread started 3 months ago without success: Thanks very much