When Formulas and Lookups are broken, there's no current way to know unless you happen to notice the red "i" in the GUI. And if your fields are hidden from display, you don't discover it unless you happen upon a bad result elsewhere. I'm proposing that the "Schema" widget can already display structure, so it could have a toggle switch display these broken Formulas and Links. It'd be a great way to audit the entire solution at a glance.