I just upgraded DU Meter from 5.x to 6.x, which offers a 'Win8-compatible' toolbar/band.
Version 5.x toolbar/band showed in Classic Shell taskbar just fine... however, although DU Meter 6's toolbar/band is available to checkmark in the right-click-on-Taskbar, Toolbars list... I cannot get it to display on Classic Shell taskbar, nor become checkmarked. I suppose I can try reinstalling... but you could download the free/trial version to test/verify. http://www.hageltech.com
Explorer often gets confused if multiple toolbars are installed or uninstalled. Try deleting the ITBar7Layout value from the registry as described here: http://qttabbar.sourceforge.net/?p=79
Ok, I deleted ITBar7Layout, as well as reinstalled/rebooted. Whichever one or all three, it worked. Thanks.