In response to my own posting here from last month, let me tell you how I solved the problem, in case others have the same one. I had tried fully charging the battery, and also tried a new replacement battery, it didn't solve the problem. But today, on a whim, I tried recording and playback with the unit plugged directly into the power adaptor, no battery -- and it works! So, somehow, the batteries were allowing me to record, but not playback. Makes no sense, but it works.

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