I see already a couple of posts about this, but I think most people miss what is happening. Every time we press update, there is an error "Please enter a URL". However, most people don't even see the error because most of the time it is not in the first screen view. You have to scroll down to see it, and because of this, most users don't even realize what the error is.
In a nutshell, Vantage wants to make sure that this field is populated as a real URL. It will not except just "www.your-site-url.com". It wants you to enter "http://". If you do enter "http://www.plus your own url.com", then you will be able to save. HOWEVER, even when you do enter http:// and Vantage let's you save it, the error appears again when you try to save again. Vantage does not remember the http:// you entered last time. So for now, to go around this bug, every time you save, update or make changes you will have to go back to this field and enter again the "http://. It is annoying especially for sites like mine where we make lots of changes and additions to events. But at least it is doable until AppThemes will fix this bug.
This is all for events (listings work fine) and in the backend. I did not figure out yet how to make changes in the front end.
Please see screen shot below.
Kosher Travel Info - Global Jewish and Kosher directory listing Kosher restaurants, synagogues and Kosher establishments around the world.