Just tried it out and wouldn't you know it... it works! Set everything up and switched it to AES, but still it was "DIN Unlock".
I then jiggled the cable a little bit and the 680 screen changed from "DIN Unlock" to "DIN Lock", but this message stayed up on the screen. I then hit enter as I would have if it said Din Unlock, and I had signal.
I shut everything down and switched it back to SPDIF and hit record/pause again and I still had signal, but no notification of "DIN Lock" this time, the signal came up instantaneously. I switched it back to AES and still I had signal that way also.
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The "cable jiggle" solution has worked on my PMSII (aka MTII) several times.
The "DIN lock" on the 680 seems to appear when it wants to. As long as I have signal I hit the red button. It's always worked.
Dave
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If you are getting a Din Lock screen during recording it means that the deck lost then reacquired signal. IF this is happening then there is some issue with the digital input to the 680. Cable, A>D issue, something that causes the lock to drop out. this can happen so fast that you will never see a Din Unlock screen. I had an issue like this when power my Pre2 with a faulty voltage converter. It would drop and then acquire signal so fast that even while staring at the screen I never saw an Unlock message but if I zoomed in on the waveform I could see the drop in signal. It was tiny and I had to know where to look or you might never find it if you were not seriously looking for it.