I'm having the same issue, and the only oddity that I can seem to point out so far is with my account itself. I've had the account since the .Mac days, so it has a @mac.com, @me.com, and @icloud.com alias. I noticed in the Internet Accounts Preference Pane that I have multiple iCloud accounts listed which are aliases for eachother. This is certainly not how I had it set up in 10.9 before upgrading this system. The first iCloud account in the list shows my @me.com alias, and the other (which is overall 4th on the list) is my @mac.com address. When I click on the @mac.com address (which is marked as inactive) I get an immediate prompt saying:This Mac can’t connect to iCloud because of a problem with “<account>@mac.com”. Open iCloud preferences to fix this problem.From there it takes me back to the iCloud Preference Pane (which shows my @me.com alias) with a password prompt asking to sign into my Apple ID. I enter the password for my iCloud account (remember they're aliases so they use the same pa
Topic:
App & System Services
SubTopic:
Core OS
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