My iCal (3.0.6) under Mac OS 10.5.6 does not always respond to the responses to invitations that I've sent. So I send out an invitation, get e.g. an Accepted mail back, and click on the .ics attachment. Often it does register the response in the iCal event, but sometimes, simply nothing happens. Also, sometimes iCal picks up the invitations from Mail automatically, sometimes I have to manually activate the response. Does this sound familiar to anyone? Any help is much appreciated, as I now often have to keep track of who's attending manually... which is not really what iCal is meant for.