Update// no good news...
I created a new site on my multisite installation (not a copy of an existing site).
I created a new form with VFB with one field, the preset 'email' field and made it required.
When I submit, it's the same issue, the page refreshes, but there is no on-page confirmation or email sent or entry in the dashboard.
Is it a multisite issue? VFB works great on the dozen other sites I have it on.
Except, it worked 2 weeks ago?