Thank you for writing.
The fact that RadWaitingBar does not start implies that you run the control's waiting process in the same thread you execute the long-running operation, i.e. on the primary UI Thread. The time-consuming operation does not allow the form to update its UI and as a result the RadWaitingBar does not move its indicator. Our online documentation contains an article that explains in details this scenario and also demonstrates how to avoid the issue through using a BackgroundWorker: http://www.telerik.com/help/winforms/track-and-status-controls-waitingbar-using-radwaitingbar-with-a-background-worker.html
Please note, that in order to allow us to continue supporting your account you should be added as licensed developer as previously discussed. Our sales department will contact you for more information.
I hope you will find my answer helpful. Let me know if you need further assistance.
the Telerik team