Hi Guido - are you using a touch screen notebook or similiar device?
If so there is a known issue that has been addressed already and will posted in our newest release shortly.
Please mark the appropriate replies as helpful / correct so our team and other members know that your question(s) has been answered to your satisfaction.
Here is something that might be helpful to you.
You can open up a web browser and go to http://localhost:4848/hub
While Sense Desktop is running. You will see the same interface
in the browser. You should then be able to perform the right click options and the drag and drop.