A pdf form I have designed cannot be exported due to an "unexpected error". What can I do?

Yes, Forms Central. I made the form by using a blank form page, copying and pasting another form I had done previously to the blank page and then modifying it.

The original form I had copied from as the basis for the new form saved as a pdf form perfectly: the copied and then modified version kept displaying the error message.

In the end I have managed to work around this problem by opening another template form (the Assessment one) and spending forever copying the items from the form i couldn't export over to the " template form one at a time (after deleting the template items, naturally).

I will be making other forms that will have versions with minor variations and it would be much easier if I could copy and paste a whole form at a time rather than cell by cell but is that going to make the copied forms impossible to export from FormsCentral as it did with this one?