Can't get Behringer MS20 external speakers to work with Optical Audio Out

I have the MS20 (Just your basic digital audio monitors with analogue and digital inputs:both coaxial and optical) speakers hooked up to the optical output from my new Mac Pro and can't get any sound from them.
I've messed around with all the sound preferences in both the System Preferences and with iTunes and DVD player with no luck.
The speakers work fine with other digital equipment I have and there is a red light comming through the cable. The speakers instructions do specify that they are compatable with the SPDIF signal. Any ideas???

I've previously had trouble getting the sound output to swap over however I did manage to get it done. What I needed to do was to change the output, change the volume up & down via the keyboard, change the output back to the internals, change the volume up & down and so on and after the 2nd/third try the external output worked.

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