Gravity Form Submit Button Grayed Out

All my Submit buttons are grayed out. How do I correct this?

I beg your pardon. I deleted the forms where that was happening, so they are no longer there. Both involved the use of custom post types, which I've been having a great deal of trouble with. The forms with Standard and Advanced fields don't have the problem.

I'm going to try to replace http://realestatemarketplace.com/list-your-homes/ with a form that maps to custom types and automatically populates the fields. That has been the problem. If I run into it again, I'll repost.