FYI: anyone who has created forms in LiveCycle Designer who buys a Mac is unable to do anything with those forms. Just another example of Adobe's complete disregard for its customers who use Macs.
Even harder to comprehend, there doesn't seem to be any effort on Adobe's part to enable saving PDF forms made in LiveCycle Designer as plain PDF forms that we can then import back into Acrobat Pro. The forms are USELESS--many, many hours of work trashed!
My "workaround," if you can call it that, is to recreate the forms in iWork Numbers, export them as PDFs, and then use the Form Wizard to create a filable form again.