Hello Robert Schnarrs,
We performed a test on our side, but we cannot reproduce the problem with events widgets. Do you experience the same behavior under all Browsers? Could you please reset your application and check if the problem exists? The next steps would be to get your project locally or to give us an access to the problematic website back-end.
About the alert message: There is logged a similar issue while using Lists module and the alert message is shown only under FF. Do you get the same error when you are dealing with all types of content?
the Telerik team