I tried the the pre-release 2.7 and I'm the same issue. In my case I have an iMac Mid-2011 with Yosemite 10.10.3 and a Macbook Mid-2014 with Yosemite 10.10.3.
I connected first the Macbook and then iMac. I can connect and reconnect the Macbook without problems, but iMac I can't.
What I can see, like a common in the first case and mine, the issue is with old Mac's. The freakman5 case was and late 2008 Macbook and my case is an iMac mid-2011.