With Mountain Lion, airplay no longer works, why not?

The only thing that has changed is that I went from Snow Leopard to Mountain Lion.
Have mid-2010 iMac, 3 Airport Express', 3 powered speakers.  Was able to send music to three rooms.  Firewall was on.
After upgrading to Mountain Lion I noticed the firewall was off.  I turned it back on.
I tried sending music via the Airport Express'.
Got a message that my firewall settings were preventing Airplay and that I should turn the firewall off.
That seems likde a bad idea.
Any suggestions?
Thanks.

I am haveing this exact same issue. I have plugging in 3 monitors and tried two different VGA to mini displayport and nothing is working. I recently bought a Acer monitor and it work for an hour and now it back to doing the same thing.
When I plug the VGA adapter in to the monitor the monitor think its not connected to a computer then when disconnecting the VGA adapter the monitor thinks it is connected to a computer.
NEED SOME HELP!!! at the point of all my hair is pulled out.
^^^
that is the same problem i am having! if anyone can help that would be great i'm losing my mind over here

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