After adding a new form field to the default form the 'ticket__cdata' table disappears from my database.  I've added various types such as 'short answer', 'section break' etc. and it's the same result each time.  I'm not sure why this is happening but it's easy to reproduce within my installation just by adding a new form field.  I haven't dug into every table but what's odd is that though this mysql table is missing, tickets are displaying these form fields (which is expected) but also saving whatever info I edit into the ticket.  My understanding was that all these form fields (when not taken from a custom list) are stored in the ticket__cdata table so it's odd how data is being stored when the table does not exist.