Are you talking about the required field option. I just upgraded and I think I'm having the same problem as you. The forum functions fine when I turned the required off but when I turn on the required option even when everything is filled out the form acts like nothing was submitted and throws up red warning "Please fill in all the required fields.". I don't think it has anything to do with a Mac. I've tested on a Dell and a Mac..
I love cform and am very grateful for it however, I wish I would've just let this update alone. I can't seem to get everything functional the way I had it before I updateed.
I'll restate the problem to be as clear as possible and hopefully help out others. Under Form Settings in the cform main setting if you select required for a field option the form will throw up "Please fill in all the required fields" when you submit a form even when all required fields are filled out properly.
If anyone knows what's up it would be greatly appreciated.
Thnaks