Our traffic is 97% IE on Windows, and while I don't have stats on how many have eBay Toolbar, knowing that Dynarch Menus cause the browser to lock up in such cases means that none of the sites that we planned to use the menu script can do so. It took us a while to narrow this down to the eBay Toolbar and Dynarch Menu combination as the source of the problem. The only thing that is under our control is to ditch the Dynarch Menu, which would be a shame. :(