try two things...
Thanks for the feedback. I tried your suggestions, but it didn't make a difference. As it turns out, I cannot send invitations either from Calendar on my MacBook Pro or the calendar on my iCloud account. So something seems definitely broken here. I called Tech Support and talked to a guy that send me on a goose chase hoping that something would miraceously fix the problem, I guess. When he wanted me to set up another user account on my laptop "just to test it out" I gave up and told him that was more trouble than it's worth.
I can still send out the invitations manually, however, at least from my Calendar on the laptop. After I create an event, I can do a secondary click on the event and select Mail Event. But it would be nice if this worked as it should so that invitations are automatically sent out.
Yes same issue. I notice that in iCal under invitees the email address that isn't getting an invite is grayed out, whereas the email addresses of the other invitees are not.The grayed-out address is not a gmail account and it is working - I can email the event manually but not through the invitees box in iCal.
10.8.2 iCal v6.0