Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 7

Roku player won't work with surround sound - advice?

I have a weird problem with my streaming Roku stick (3500EU running v 8.0.0.).
When I connect it directly to my home cinema projector (a Viewsonic PJD7720HD), it works fine.
But when I connect the  Roku to the HDMI port of my surround sound (a Yamaha YHT1810) - which connects via HDMI to the projector - the picture from the Roku flashes on and off every couple of seconds indefinitely. I have tried replacing the HDMI cables to no effect.
Is this a known problem, or are there any suggestions for how I can get the Roku to work with my home cinema system?
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