I'm using ProForm and just upgraded from 1.64 to 1.73. (Running EE 2.10.1.) Since the ProForm upgrade, none of my (visible) form fields show up. The labels for them appear, but absolutely no HTML for the fields themselves.
The hidden fields (including some custom ones) show up fine in the source.
We're using the simple form tag, so it shouldn't be a template issue.
Any ideas on what's going on?