Email not sending

UPDATE:  I think I figured it out.  Seems I needed to use "Member of" and not "Added to List."  Whew.

I am trying to send an email invitation to a list using a campaign that also updates program status, lead source, etc. It does everything but send the email. 

I've created a smartlist to doublecheck if these emails are being sent and, so far, none of them has. 

I did make a change to the campaign, which originally included a sync to SFDC step. But since some of the emails lack a CompanY Name, I removed that (since it would not be able to do the sync without it). I am wondering if that's the source of the glitch, but why won't it send now that I've removed it?

Any help is much appreciated!

Jennifer