My basic setup is this: Sources -> Marantz amp -> Darbee Darblet -> JVC projector For a long time this arrangement had given HDMI problems, but from only one source: a Panasonic Freesat receiver/HDD/Blu-Ray recorder. And curiously the instability (white flashes, occasional complete loss of picture and/or sound) only occurred when playing discs or accessing the Blu-Ray/DVD menus: it never happened when watching Freesat channels or material recorded off air. I've experimented with different cables, using different output sockets on the amp (and input sockets on the projector) but to no avail. I bought an extremely budget Blu-Ray player and used that instead of the Panasonic. Today, it dawned on me to try removing the Darbee from the system and testing a DVD and a Blu-Ray disc on the Panasonic again - and the result was complete stability. I put the Darbee back and the problems immediately returned. Given that the Darbee doesn't appear to affect the signal from any other source, it seems unlikely that it's faulty, but I suppose it is a possibility. Or could there simply be some sort of incompatibility with the Panasonic? I did have the Panasonic checked by a local service agent and they found nothing wrong either in general or with the HDMI circuitry. I should be sorry to lose the Darbee since I'm used to its effect and like it, but it's good to have the Panasonic for discs. I'd be grateful for any thoughts; many thanks. .