Appointments plugin not working

Hi,
I purchased the Appointments plug-in yesterday, (Transaction ID:xxxx) installed, activated it and it does not seem to be working. It shows up on the page, but I can't request an appointment. I have other plug-ins, but de-activated all of them and the Appointment plug-in still does not work. I have also checked for javascript errors as suggested in your FAQ's. Please advise what else I should check.
Thanks,