OK – I can now see something.
1) If I sync to wordclock and feed it ADAT, the ADAT shows slipping on power up, but can be fixed by disconnecting and reconnecting the ADAT. Reconnecting the WC makes no difference.
2) If I sync to ADAT, it is OK at powerup.
3) If I sync to anything other than WC and then select WC, the ADAT shows slipping as in (1).
So, sorry guys – it is a real issue and we'll look into it. For now, a reasonable workaround would be to sync to ADAT.
Note that V5.5 shows the same behaviour, so this is not a "new feature" and has clearly been like this for some time.
