I was being dumb on this one - the issue was I was using a link to submit rather than a submit button. Changing it to a submit button made everything work - sorry!
FYI - in the example you guys give us in the zip file the name and id are different - that is why I did it that way (originally I had them the same and thought that might be the issue). Just in case anyone else is reading this, wanted to point it out that from everything I can tell, they DO NOT have to be the same (although it is good practice).
Thanks!
Jenn