Mountain Lion calendar .ics invitations don't go to date of event

Hi there,

I installed Mountain Lion recently as a stepping stone to Mavericks.

When I receive Calendar invitations in the form of .ics attachments and open them Calendar does not take me to the event.

This means that I have to trawl through Calendar trying to find the event before I can see if it clashed with anything else and accept it.

I was using Snow Leopard before and .ics files would always take me to the correct date on the Calendar.

Ant ideas on how to fix this would be greatly appreciated.

I've searched the forums for hours but not come up with anything. Possibly because I'm not entering the correct search terms? I don't know and I'm frustrated by this new foible.

Many thanks,

Richard.