iTunes 12.3.3.17 can't connect to AirPlay devices (Airport Express)
After updating to iTunes 12.3.3.17 I can no longer connect to Apple Airport Express.
I have updated iTunes to 12.3.3.17 on two computers:
1. Windows 7 64-bit SP1 / iTunes 12.3.3.17 64-bit
2. Windows 10 64-bit / iTunes 12.3.3.17 64-bit
On the Windows 10 computer, iTunes can connect and play to all three Airport Express. An iPod Touch can also stream to all of them.
After updating to 12.3.3.17 on the Windows 7 SP1 computer, iTunes can see all three Airport Express and they are not greyed out. But when any of them are selected in the speaker dialog, iTunes tries to connect and after 30 seconds generates the error "An error occurred while connecting to AirPlay device "xxx". The network connection timed out" and the selection is then greyed out.
The network card on this PC, the router and all three Airport Express all seem to be working properly as I can stream to all of them using the third party software "Airfoil" with other applications as the source. I can also control iTunes on the PC wirelessly from the iPod with the Remote app.
I just can no longer stream to any of the Airport Express directly from iTunes after the 12.3.3.17 update.
Any thoughts?
Windows 7, SP1 64-bit / iTunes 12.3.3.17 64bit