Calendar app does not show iCloud shared calendars

Question

This is a tricky problem to describe, so bear with me.  Another iCloud user is the owner of a shared calendar, and has invited me, with read/write credentials (ie, it's my wife and my shared home calendar).  In the Mountain Lion Calendar app, the shared calendar shows up in the sidebar list, and the events are physically in the calendar (ie, the "Shared Home" calendar shown here):
But, when i try to create a new event, "shared home" does not show up in my selection list:
Also, if i go back and look at an event that is from the "Shared Home" calendar, it shows up under the generic "Calendar", under "On My Mac":
Now if I edit one of these already created events, it does indeed push back to iCloud, just as if "Shared Home" was the calendar.
But why can't I create a new event under "shared home"?
This is only a problem with the app on my mac.  On the phone, or on iCloud.com it works perfectly.

Answer 1

I have exactly the same problem. The shared calendar will show up on the list to the left if I open it. And if I create an event, I can drag it to this shared calendar. However even if I've done this, when I open the event it shows it as being in a different calender [with a different colour], but still has the right colour for the right calendar when I close the info box. what's going on?