I have the same problem, and its annoying me, I have deleted the program, removed the registry entrys, rebooted several times, reinstalled the program, re connected to the site, deleted and reinabled my groups, and STILL when I press the power button on the application, I get a denied error.
Please can someone enlighten me to the issue and its resolve.
Thanks
( I might add that in the sites FAQ for the same problem, it just shows a white page with no actual details to help with the issue , so you might want to look into that too )
Thanks again.