I've been triple boxing on my iMac (with 2 Thunderbolt displays) for about 2 years.
I was using CloneKey, but that stopped working so I changed over to MultiLaunchBox.
That's been working great for Cataclysm and MoP.
The WoW software recently required me to update the OS from 10.8.x to 10.9.x and that was no big deal,
but now with patch 6.0.2, MultiLaunchBox is no longer working.
All posts I have seen are dated 2012 or older, and it looks like nothing is supported any longer.

My main question is: are there any replacements out for CloneKey/MultiLaunchBox functionality on a Mac?
I'd like to keep multi-boxing, but not being able to broadcast keys to all three windows makes multi-boxing impossible.