I have a fresh install of testing amd64 as of two days ago. Right after the installation the Update Manager orange star appeared in the gnome panel notification area. Hovering over it revealed that there was one upgrade available. But running Update Manager (either from the panel icon or from System > Administration) does not show any upgrades available. From the command line apt-get check, apt-get update, and apt-get upgrade do not show anything wrong, nor are there any packages to upgrade.
The problem appears to be just in the gnome panel icon. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org