Back to My Mac - Screen Sharing Mac OS X 10.10 problem

Sense Mac OS X 10.9 great feature Screen Sharing & Back to My Mac does not works any more.
Mac OS X 10.10.1
Russian interface:
We can see remote computers, but can not connect. We get a error.
English interface:
We can not even see remote macs.
If I start up main computer from Mac OS X 10.8 Screen Sharing works fine. Remote macs has Mac OS X 10.8 and 10.9

I have the same problem, just today (although I'm still running 10.6.8). Every morning I turn on my main Logic mac then fire up my 2 slave macs, connect to them, activate Screen Sharing, and get going.
This morning I tried it, connected to the other macs as usual (I can see/access/alter their hard drives from my main mac) but when I click "Share Screen" I just get the "connecting" dialog box & it just keeps going.
The weird thing is, when I put my laptop into the network via wifi, I can screenshare my main mac's screen (all 3 of them, actually!)  but not my 2 slave macs that are ethernet'd to the main mac.
I've tried every solution I could find via google, and nothing is working.
Kirby

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