Everything was fine during the beta period. After final 10.10.3 when I go to use iMessage it just hangs at login. I have tried signing out of my AppleID and restarting in safe mode and after resetting smc/pram, nothing works. I noted the Find My Mac not working because even though it says I'm logged into my AppleID on iCloud.com my Macbook doesn't show, just my iPhone. I also tried on different wifi system to rule out the router, same results.
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