Problem has been resolved. After I uploaded the whole site again, the form appears to be working fine.
However, Jason (or someone knowing), what associated files and/or folders are created by FB? I had been uploading just the form file itself and the CSSForm_Builder and WA_ValidationToolkit folders, rather than the whole site each time. But, I apparently missed something. (NOTE: I already had a WA_DigitalFilePro and ContactForm_GMC folders, previously, but did not re-upload each time I made a form change since I didn't think FB used them.)
I don't want to have to upload the whole site every time I make a correction to a form as that would be 1) time consuming (very large site) and 2) I want to track specifically what files and folders are being changed by FB (as my customer only wants to upload changed files/folders, not the whole site each time). Perhaps that is already documented somewhere by WeAssist?
Thanks. And, Jason, please delete that file I posted.