Hi,
Thanks for purchasing Pro and sorry for the issues you are having.
Do you have you account you created when you purchased Pro? In the future can you please login and post support questions in the Pro Forum as this forum is for Pres Sales Questions.
For this time I can help out here, do you happen to have Jet Pack installed and using the visibility feature? There is a glitch causing the widgets to not display if that is the case.
Does the fix in this thread help if that is the case?
Jetpack's Widget Visibility broken by updating to ECP 3.9.1
Let me know and we can go from there.
Thanks