tracked down to some other app If you have an nVidia card with the 260.xx drivers, make sure you have NvXDSync.exe running in taskmanager. If it isn't it will take over 20 seconds for the r-click menu to appear. That did the trick.
Update. Weirdness with rightclick/nvidia CPL.
If rightclick enabled all goes well till you reboot. After reboot rightclick desktop menu comes very slowly and the NVIDIA cpl link has disappeared.
Disabling and rebooting the desktop rclick comes up normal but without the Nvidia cpl link. A reinstallation of the driver package is necessary to get the cpl back. Nvidia drivers 260.xx