My wife and I both have Macs running Mountain Lion. She has several calendars which she set up in iCloud ("Family events", "Medical Appts" etc), and she shared them with my @iclould.com email address. I got the email, and I "accepted" the invitation (and she got the pop-up notification that I had joined the calendar). I can now see the calendars when I log into icloud.com on my Mac, but I _don't_ see them when I run the Calendar application (a.k.a. iCal) on my Mac. I double-checked that my Calendar --> Preferences have my iCloud account "enabled" and set to "Push" notification.
My wife also removed my access from the calendars and added me, so we went through the process a second time, but with the same results.
I don't see any solutions after a web search so I hope someone here can help me figure out what to do.
My computer: 2009, OS X 10.8.2
Her computer: 2012, OS X 10.8.2
Thank you, but actually, I should have specified when I said "I don't see any solutions after a web search" that I found those instructions and followed them, but it didn't help. We left our computers while we went out for dinner, and checked them 3 hours later. Miraculously, the missing calendars showed up after that. We just must not have waited long enough (30 minutes) for them to show up.
Reminds me of the first time we set up a home network, about 20 years ago, using 10-base-2 (coax). The instructions (for either Microsoft or Dell, don't recall which) actually said that "it may take up to 60 minutes for all computers to show up on the network". Didn't take that long, but it did take a good 15 minutes, IIRC.
Thanks, and Happy Holidays!