After I went through the install routine for Diigo toolbar on IE8 (Vista), the toolbar was nowhere to be found. The little blue 'd' logo shows on the upper right corner of page, but clicking it does nothing. When I go to Tools | Internet Options | Manage Add-ons, the Diigo Toolbar, Toolbar Helper, and Sidebar are shown as enabled. Thanks.

Right-clicked on the IE menu, but Diigo toolbar is not listed. The only choices are (in order down from top): Menu Bar, Favorites Bar, Compatibility View Button, Command Bar, Status Bar, Lock the Toolbars, and Customize >.

Uninstalled Diigo Toolbar from Control Panel | Programs and Features. Tried reinstalling the Diigo toolbar. All the messages looked normal. Still no luck. I'm running Norton Internet Security (v17.8.0.5) with all virus profiles up to date.