Would it be possible to add some validation that simply attempts to validate e-mails based upon spaces & carriage returns on the server side in addition to CSV. This would be best from a UI perspective. From the example I didn't notice that there were comas after the e-mails and only saw the carriage returns. In an ideal world the software would be smart enough to anticipate what the users intended and accomodate.
Emails in invitations are accepted in client side when separated with spaces, so you get an Oops from the server side.