Thanks gonk.

It would be more intuitive if it said "no signal", so does "unlock" means no signal (or if you are not on auto signal sensing, the signal it's looking for is not there)?

I found a few threads briefly discussing S/PDIF unlock "problems"
In this thread coto914's 950 is out for service for the problem.
In this thread 2 stott seems to be sending a signal the 950 isn't recognizing.
And in thread 3 the interconnect seems to be the culprit.

It would be nice to know there's nothing wrong. I haven't seen many postings by coto914, but I'm wondering what his problem was.

Is my best solution to switch the input to analog for these stations, and back to digital for the ones sending digital? Not elegant, but it will work for now.

Thanks.