Dealer and Eddie @ SIM2 came up with the same fix, using auto to "re-sync" - this must be 4-5 months ago I think. I'll ask them again sometime about updates.
AFAIK the 300 software can be used on the domino 30's, but IIRC not all functions fully work - I might ask them if this new software would confer me an advantage with the dreaded macrovision pulses!
Don't get me wrong though, the issue only occurs perhaps once in every ten power-ups - but it doesn't make you look swish when you power everything up in one keypress on the pronto, and your DVD source is "vertically rolling"! (with your friends round)