Notes and Location field disappear in iCal when I add invitee

What's up with this?

Also, once I add an invitee and hit Return, I can't delete the person. I'm getting a question mark icon next to everybody, which is silly because AddressBook was used to make the suggestions I typed in.

Running Snow Leopard 10.6.7, new user. I have a "me" card in ICal.

Anybody know what's going on?