I had a similar issue, solved by doing what others are saying (set digital audio output to PCM) and then setting the output as TV speakers instead of the digital output itself. I then unplugged the cable and plugged it back in. Suddenly I could hear both from the TV and the speakers. When I switched it to just optical out it only came through the speakers.
I think it may have to do with the fact that I plugged the Toslink cable into the TV while it was still configured for Dolby and bitstream. Replugging it in with PCM set as output caused it to work exactly how I wanted it to!
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