I upgraded to Internet Explorer 9 this weekend, and then went to visit my website. I noticed that after the upgrade, there is a little mark in the menu (see attached screen shot). It is a DotNetNuke site (5.6.4) and the skin uses the solpartmenu. The little mark shows up in the position of the right arrow for when there is a submenu. I tried setting the userarrows="false" but then it put the little black mark on all of the tabs, even those with submenus.