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Are others having this problem.

Yes. I don't know why this wasn't found in the original testing, but it's been reported several times since the Central was discontinued. Perhaps some outboard DACs are more forgiving than others, but for the unlucky ones (including me on my Pioneer optical amp) the Central gives rise to sporadic clicks on the left channel only. No-one's ever investigated the problem fully, but it sounds as if the optical timing is a bit off, and every so often either Central or the DAC just skips one or more samples on the left channel.

Peter