Hi all. This is my first post on the forum; please go easy on me and I'd be very grateful if you would comment or advise. I've got a problem on a test bench. I have designed an HDMI distribution system which consists of Wyrestorm HDMI HDBaseT lite receivers & a 4x4 HDBaseT lite matrix. There are 2 TV's, and 3 HD sources. TV Locations: Room 1 - surround sound receiver (Marantz SR6004) Room 2 - LG TV (stereo audio) HD sources: Sky box 1 (Sky+ HD Amstrad DRX890) Sky box 2 (Sky HD multi-room box) Apple TV (2nd generation) Of the HD sources, the Sky HD multi-room and Apple TV both output surround sound multi-channel audio over their HDMI ports. The Sky+ HD box DOES NOT. With this in mind, in order to get multi-channel audio from the Sky+ HD box to Room 1 I have run coaxial audio out from the Sky+ HD box and via a digital audio (coax) matrix and then out to the surround sound receiver. The problem I am experiencing relates ONLY to Sky box 1 (Amstrad DRX890). Here is a description: When Room 2 watches Sky box 1, audio is fed to the TV over the HDMI connection. When someone watches this box in the Room 1, audio is supplied over the separate digital audio (coax) output via the digital audio matrix. Now, I notice, at times, a lip-sync issue on BOTH the Room 1 and Room 2 TVs. I have noticed that if I power-cycle Sky box 1 the issue is resolved, so I've installed a timeclock which power-cycles the Sky box 1 daily. This has not permanently resolved the problem. I have noticed this problem where if I switch between Sky box 1 (while noticing a definite lip-sync problem) and Sky box 2 (where the audio is always perfect), and then back to Sky box 1, I find that the lip-sync has been corrected... other times I carry out this process and notice no improvement. The gremlin appears to manifest erratically. I am not clear on how lip-syncing works, but a thought is that perhaps the problem is because, on Sky box 1, audio is being put out over both HDMI and the coax digital audio outputs. It occurs to me that perhaps it won't work reliably if the audio is put out over both of these outputs simultaneously. Perhaps lip-syncing on the HDMI output 'wins' over the coax output, and then it changes to prioritise the latter soon after. Or perhaps lip-syncing isn't carried out at all on the HDMI output, and it's just the Sky box that is getting confused and causing unnecessary lip-sync adjustments on the coax digital audio output... I wonder if anyone has experienced this problem before or might be able to shed some light on it. Thank you for reading this!