Update: This issue was resolved December 6 2007. A New version of Telenav was released and users only need to uninstall their current version of Telenav and use the Telenav Plug-in to locate and download the updated version. Once the new version has been installed, this issue should be resolved All you need to do is uninstall the current version of Telenav by going to Start>System Tab>Remove Programs. Next, Soft Reset your device after the removal and then use the Get Telenav Plug In on your device to get the updated version.

There have been reports the Today screen flickering on the AT&T Tilt.
The flickering reported is limited to the Today screen on the device and only impacts sections of the Today screen (calendar section, program plug-ins, etc.) and not the entire display.

Or, alternatively to simply stop the flickering without the need for any download, just disable the Telenav from the today menu Start->Settings->Today - Items tab, uncheck TeleNavPlug. You will still be able to use Telenav, as this only disable the Telenav plugin from the Today screen, to run Telenav use the menu on top or go to Start->Programs->Telenav.