I set up my save the dates using wedding wire and before I decided to send out to everyone I sent an invite to myself and my MOH as a test. i'm so happy I did becuase it didn't work. It didn't work when I used an apostrophe?? Did you end up using wedding wire for your save the dates or invited? Any tips? Here's a screen shot of what it looked like.
Save the date error
You could always play around with the invitation section of the Guest List in Wedding Wire.