Bentley View update 11 does not start

Hello,

I'm using the free version of Bentley view. Now I installed the Update 11.The connection client works well and everything seems to be okay. But when I start Bentley View CONNECT edition, I get the message: "Unable to start "Bentley View" Licensing service failed with error code -1. Please contact your local Site Administrator for further assistance."
I am the local Site Administrator, but have no idea what to do. Can anyone help?
Thanks a lot.
Claus