elephant:
Are all three ATVs the same type, and if so at the same software levels ?
I have taken a look at my ATV (2nd generation, very small black unit) and its settings.
Mine is running 4.4 (latest patch level is 4.4.2).
The only thing I can think of, on your two ATVs that mis-behave, is that the delay is set to zero and therefore starts immediately ?
First B&O (1976) was a Beogram 1500 ... latest (2011) change has been to couple the BL11 with the BL6Ks *sounds superb*