I have two Macs (each with ML) on my iCloud account. My MBA has all the contacts but is missing a number of groups in Contacts that are on iCloud and on the other Mac. All the other apps seem to be synced. How can I best get the Contacts to sync? It looks like all the contacts are there but not the groups. Should I manually create the missing groups on the MBA? Or what? Thanks.

Are the missing groups under "iCloud"

Thanks for this question, JEBB. I'm having similar issues with Groups. Not just on my Macs, but also on iPad. Looking forward to an answer...

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Ken Sp.
Are the missing groups under "iCloud"

All the existing groups shown are under iCloud. There is also a category "On My Mac" with no groups within.

The answer, I was given, is to sign out of iCloud on your browser and sign back in. It worked for me.