ITunes and Airfoil on MBP no longer see Airport express. Why?

I use an Airport Express to stream music from MacBook Pro (10.6.8) to our home theater system. Has always worked fine (with both iTunes 10.7 and Airfoil 4.7.6) -- up until recently. Now iTunes no longer has the button to switch speakers and Airfoil no longer has any speaker options.
The MBP itself sees and connects directly to the AE with no problems. Good, strong signal but it is no longer being detected by iTunes (or Airfoil).
My iMac (10.9.5) also sees and connects to the AE... and the iTunes on the iMac sees the AE and streams to it with no problems so it seems the AE is still working okay for this purpose.
Has something gone bad with the iTunes on the MBP... and also with the Airfoil at the same time?
Any possible solutions to this problem?
Thanks so much.

I have the same problem with Windows 7 64bit. ITune can see AE and stream Music well. Airfoil, TuneBlade (airplay soft) can also see AE but can't connect and stream music. I ' ve already tried to setup firewall Exception list, even turning off firewall off both windows and antivirus but still got the same problem with the message 'Airfoil was unable to connect to the remote speaker " ... 's Airport Express". Please check the firewall on the computer where " ...'s Airport Express" is running and try again'. Any help would be appreciated !.

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