Streaming from MBP to Samsung TV WITH EXTERNAL SPKRS --AUDIO ISSUE

Hel
Using the Mini-Display adapater, MINI Displayport TO HDMI ADAPTER, I have been able to stream live car race from MBP directly to my Samsung HD TV.
Streamed picture is wonderful. To get audio from the live stream to come thru the external speakers, I used an audio cable (3.5mm pin that plugs to the MBP, with the RCA jacks plugged into the component's (the receiver) audio out sockets), but still I not yield the desired result.
Yesterday, I purchased an AUVIO® 6-Ft.Optical Audio Toslink™ Cable . To test this new cable, I live streamed an ESPN2 program to the TV--I was pleased that the sound did come thru the external speakers. After a few mintues of ESPN2 streaming, I navigated to YouTube but lost the sound to the external speakers. To troubleshoot, I returned to ESPN2 again, for the live stream (thinking maybe YouTube has an issue). Unfortuantely, there was no sound to the external speakers. Why it had worked properly only moments before and not now? I turned everything off and started from the beginning. No luck.
I went thru the MBP tools, settings, preferences, etc. Is there a setting I have overlooked?
Any and all help is appreciated
Sincerely,
FMW

OK, so I've done a couple things here and both point to the above post about having two devices doing AirPlay at once.
First things first.... I ran the Inssider tool and looked over my network. My signal seems to always be between 50 and 60. My router is on Ch 6 which seems to be the best choice. There's one other network on that channel, but it's a very low signal strength. The other ends of the spectrum are pretty well covered by other networks.
Does this shed any light on this problem?
Second - I hard wired my MacBook to the router, then screen shared to the Apple TV. It was up for at least 15 minutes. At some point, I looked over and it was no longer sharing, but the network *WASN'T* trashed like it normally gets. So it possibly got dropped for some other reason.
Third - I forgot that I have an Apple Airport Express that I normally use to stream music to a radio in my garage. However, this device can be used as a router. So I set it up this way and created a 2nd network. I only put the Macbook and the Apple TV on it. I've been streaming continuously for about 35 minutes now with no issues.
So it would seem that there's a firmware issue with this router that won't allow one device to Airplay to another device. Does anyone else have any other conclusions or suggestions? Otherwise, looks like I'll be treating myself to some new hardware after Christmas.
Thanks very much for your help!

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Please a need help with this. It's getting really frustrating. I'm trying to get help from Focusrite support as well.

In case another poor man like me run into this issue, here's how I solved it:
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http://global.focusrite.com/answerbase/how-do-i-remove-saffire-mixcontrol-from-m y-mac
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