I have been having problems with the forms as well.
I have a thread going on the concrete5 boards: http://www.concrete5.org/index.php?cID=337111&editmode=
I also just realized the "Notify me by email when people submit this form" option is not working correctly. It will only email the first address, then you will receive a Mail Delivery Subsystem error saying it cannot email to the second. For example:
only emails firstname.lastname@example.org and you receive an error mail saying it cannot email email@example.com
and when you enter...
bar will receive the email, and foo will receive an error mail.