Issues with Signing into Messages

[bunnspecial]

This is the second time(and second computer) where I've had this problem in Yosemite.

Basically, when I enter my iCloud username/password I'll get hung at the sign-in screen and it never will connect.

I have three computers running Mavericks now associated with this iCloud account that work fine with Messages-it seems to only be Yosemite where I'm having trouble, and only recently at that.

Below is the screen where I get stuck.

Any thoughts on this?

 

[bunnspecial]

Nevermind-I was running 10.10.0, and it works perfectly after updating to 10.10.3