I was able to create a recurring event on your site without problem. But so that I can test, what information are you entering (the easiest would probably be taking a screenshot before you save). Then I can try to replicate the exact input your using and figure out why it's failing without an error message.

Here are two screenshots

I'm pretty sure the problem has to do with the lack of an End Date. Recurring Events cannot be done indefinitely, and also, I strongly recommend doing at most 3 months at a time, extending as needed (this is for performance reasons).

But thank you for the heads up. There should definitely be an error message for it.