Are you using Clover? If so which flags are you using? I have the exact same settings I had in 10.10.1 and but the driver 346.02.03f01 and I can't get DP 1.2 to work. Once I switch the monitor to DP 1.2 it goes black immediately.
I got it to work, mostly out of pure dumb luck I think. I tried upgrading to 10.10.2 then realized that nvidia drivers don't work well with 4K 60z & MST so I downgraded with Time Machine. After that was done it asked me to log back into iCloud and it all worked well.
I was able to successfully get iMessages to work correctly. However my iCloud preferences pane is still broken and I can't seem to be able to get it fixed. Whenever I try to open it, it just crashes immediately. Same with internet accounts.
Any suggestions?
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