IMac silent stream bug?

I have my iMac conected to my Onkyo reciever via a toslink optical audio cable. On the reciever it shows PCM, which is uncompressed stereo channel audio coming from my iMac. When I play music or videos or any other audio, the PCM text shows up on the reciever. When I stop playing the audio source, like pausing an iTunes song, after a couple of seconds PCM dissapears, meaning the stream is stopped. As long as audio is being streamed to the reciever PCM is shown, however, when it does not display PCM, and I go to resume a song, it takes a couple seconds for the iMac to send the signal as well as it takes time for the reciever to start the stream and turn on PCM.
The 'silent stream bug' is prevelant in windows computers as well, even worse that it is with my iMac. There is a program for windows called 'AVR Audio Guard' that is basically a temporary fix until microsoft fixes the bug. There is no such application available for OS X. Some people believe it has something to do with graphics cards, but it isn't relevant.
I have made a temporary program that actually just plays a silent wav file on loop indefinitely, which isn't optimal because it uses up some of the cpu as well as when I have to shut down, I have to force quit it before the iMac can shut down.
My question is, how can I fix this bug/problem or is it something that apple must fix?
Does anyone else have this issue?

were you able to find a fix for this? i connected my macbook pro via hdmi to my receiver and first part of the song is always cut and movies too whenever theres a quiet part the receiver shuts off sound then when sound plays again first part of the sound will get cut off. is there any fix for this?

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